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We don't compete in your space, but we do have a site that competes by keyword overlap with sites that advise on alternative medicine.  The overlap consists of at least 100 keywords, many of which have a monthly volume of 10,000+

The comparisons of our site vs alt med sites are as follows...

university degrees and government-issued licenses   vs.   author panache and social cred

scientific terminology  vs.  common language (which has a higher search volume)

factual information  vs.  lore and creative writing

Over the past two years, on three occasions, we have received substantial improvements in rankings and traffic as the alt med sites have dropped.  I attribute it to Google wanting  the SERPs to be populated more with formal credentials and technical prose rather than with lore and panache.   We intentionally improved how our E-A-T is displayed about two years ago and I think that has been helpful.

In these situations, a person can only guess at what might be doing this, however, other sites similar to ours have seen the same improvements at the same times.

Imagine the population of people who are interested in the bedroom topics that you have written about...  I think that they would fall into three groups...

1. people that enjoy the "dirty talk"

2. people who don't care about it - they just want to read the content

3. people who are put off by the "dirty talk" and don't share the content or even read it very far

I think that group 1 would continue reading if the language was cleaned up, but if the language was cleaned up group 3 might appreciate the content and read it and value it.   Google might have a similar view and discriminate against "dirty talk", unless the searcher has safe search turned off.  So cleaning the content up might improve rankings.

You said... "this one continues to tank".   What exactly does that mean?  A slow and steady ranking and traffic decline?  A slow and steady loss of traffic through external links?    Or have there been a small number of sudden drops in visitors, in rankings, in revenue?

If your answer is "slow and steady" then I would bet that much of the loss is coming from the increased competitiveness of the internet and the emergence of new competitors.   Anyone who owns a 15 year old site that has not been getting a lot of regular new content and existing content improvement is seeing this.

If the losses are small and sudden, then it could be algo changes at Google that is knocking the site because they don't approve of something.   Just speculations.

I agree with everything that effectdigital has posted.

If that page about visas is pulling in the traffic and not converting, I would make sure that it has some visible Adsense on it. 

Several years ago, I added one wildass article to one of my sites and lots of my visitors consumed it.  So, I added another, and lots of people consumed it, and the both of them were pulling in good traffic from search.  Today, there are about 100 articles in this vein on the site, and the category page for this content ranks #1 for a one word query related to this content that most people would think to be crazy difficult.   This stuff pays, and the rest of my site has no problems ranking for anything.

If you merge these five sites the results will probably be kickass.   Simply kickass.   I believe that the strength of all of your pages will benefit in terms of Google performance.   You might also find some cross-selling and cross-content promotion that is extremely valuable.

I like this method because it will probably be easiest to do...  https://newtoplevelsite/site1/products

But, I like that method if and only if these sites do not have a lot of duplication.  If there is a lot of duplication, I would do the long and tedious work of totally restructuring on the basis of topic.

About this question...  "Does anyone have any experience with how the DA would flow through to the new site?"

I would not give it a single moment of thought.

I think that it is extremely risky.  The more work and money that you have invested in the website that will be the recipient of the redirect the greater the risk.

This is a methond for people who do not have a big investment in their website and are simply looking for a low effort way to gain a small amount of ephemeral juice.

Don't make any special effort to get custom anchor text.  Allow the webmaster of the linking site to decide.  Then your link profile will look natural.

Lots of SEOs believe that putting a bunch of pages (especially your money pages) on a subdomain is not a good idea - because if they were in a folder they would rank better because their linkjuice is part of the main site.

Having a duplicate set of product pages that have noindex links into them is a crazy idea for many reasons (SEO, maintenance, linkjuice waste, plain irrationality).

Your company, IMO, is a good target for take-over or buy-out.  A new owner could streamline this stuff and make a lot more money.    If a new company buys for this reason, they will probably fire all of the SEOs and use their own.

Opinions on this may differ.   As a manager who is paid in the basis of performance, I have told you where my bets would be placed.

It is not the keyword collection that matters and it is not the publishing platform that matters.

What matters is...

• *  the knowledge and writing skill of the author

**  the reputation of the author

** the substativeness, comprehensiveness, usefullness, or entertainiment value of the content

** and, the level of importance that this "blog" holds in the author's mind

If I started a new website, and gave to it the four things that matter above, I think that it would take a few years to get it producing traffic at a level that would provide a good return for my time.  I am better off expanding and improving another website that I have been working on for a long time, which already has traffic and a tribe.

"I am publisher medical base website and last few days, i have notices that i could not find my rectally updated articles that don't show in the google scholar."

If the content that you presented to Google was the same quality as what you presented here, it would not surprise me if Google ignored the articles.  Google is really picky about medical content.

Our website currently gets approximately 1 million page views per month with 200,000 unique visitors would there be a way to leverage this to (ask or obtain) back links from sources?

If you   A) have  that kind of traffic;  B) have fantastic content;  and,  C) promote your best content to your visitors,   then you should have the ability to get spontaneous links from your tribe.

When our sites were new, we built a few links.    Once we got traffic like yours we almost stopped.  Now, we might send a dozen link request emails per year.  These mostly go to webmasters who have a resource page and our resorce is 10x better than anything they are already linking to.

Another method....  Sometimes they have kickass content and we, while writing a great article on a parallel topic, include a couple of paragraphs about their work and cite them as a reference.   We write to let them know and we wind up with a link on their "In the Media" page.

If someone would write to us and say.....   "If we create this, will you link to it?"

My reply would be, create it and you will have a very small chance that we will link to it.

Why would that be the reply (actually, I would probably delete that type of message).

Because...

A) we might already have the best content on the web for that topic

B) what you think is good, might not be what we think is good

C) we might not be interested in linking out to a site about that topic

D) if you create something and show it to us, and we want to link out to a site about that topic, we will go straight to the SERPs and find the best piece of content about that topic that we can locate, and yours will unlikely measure up

We link out for a reason, not because someone suggests something.  When we link out, we know that our visitors are interested in something and we want the target of that link to be the best thing on the internet for that topic.  We don't want to send our visitors to the third best content or the fifth.  We want to link to something that makes our visitors to shout WOW!

When you see links on a website, those links were probably built  while an author was writing the article on that page... and they want to create an attribution link to an expert's website because they are using what she wrote as  a reference.

We link out to lots of websites and lots of people contact us wanting to get a link.

Fact is, we rarely link out to the people who contact us, mainly because the content that they suggest is crap.

The really good sites that link out, are not linking out just to link out.  Instead they are linking out to content that is much better than what they are able to produce for specific topics.

So, if you are looking for links on top quality websites make sure that the content that you recommend will make them say WOW!.   Otherwise, you are wasting your time.

From an SEO stand point?

-- Google might consider the links in this article to be paid links.  If they are marked as nofollow or as sponsored then they should not have a bad SEO impact.  But if they are not marked nofollow of sponsored then they might be a problem.

-- You got an article because you want to increase brand visibility.  So, what is the DailyMail doing to deliver traffic into your article?  Are they shouting it on on their home page and on every relevant page across the site?  An article on an orphan page is worth nothing.  An article on a heavily promoted page is worth a lot more.

-- How long is the article going to be there, and how long will strong promotion of it persist?

-- It's a thin content article.   It would be best to give them a very high quality article if lots of people are going to see it.   That will produce a positive impression for your brand.  The high quality article will also rank better in the SERPs, if the Daily Mail is allowing it to be indexed.   If it is going to be used on the DM for a limited amount of time, it could then be used on another website or your own.,

-- How would I spend my next block of money and time?   I would make a kickass 10x article and post it on my own website.

"Ultimately, you should be trying to come up with ways to make your website naturally link worthy so that you end up getting links which you didn't ask for."

Paddy is absolutely right.

You say that you have rakings for 15,000 keywords.   Let's say that is done by 500 articles.   If your content is superb enough for each of those 500 articles that the pull in  just one natural link per year for each.  That is a nice number of links.

If you spend the next year improving that content enough that each article pulls 2 links per year, that is almost like having a full time person doing link building.

Let's consider two goals...

First:   Try to improve rankings where a modicum ranking improvement in position will best move the needle of your business.  Very often these are pages on your site that rank at #4, #5, #6, or so for money keywords at the present time.  Getting a ranking boost there will result in a major improvement in your revenue.   Improving the content on that page and making other improvements that might facilitate conversions can make big paybacks.

Second:  Often, people try to improve the rankings of sales pages, but, it is often easier to improve the rankings of article pages - especially if they are fantastic.  So, I would suggest, after picking some pages for your first goal, write comprehensive articles that thoroughly explain that topic.  These articles might attract links, they might be better targets when asking for links, these pages might rank better than your sales page.  You will link them to your product pages and make every visitor to the article page know that you have the items for sale.

Took a quick look at your site... you are not on the first page of Google because you have not earned it.

If you want to earn it, write some real content about the subject.

What is it?  Who cares?  Why is it important? Now go deeper on all of those.  Start writing a library about this.  Having it sprinkled in the titles of a few articles and in the title tag of your homepage doesn't earn anything.

#1 positions, even #10 positions are earned by becoming the global school for something.

If this is where you want to be seen, then when a visitor lands on the homepage  of your site they will realize that they have arrived at the right place.

Onpage optimization can get you rankings when competition is low, especially in local SERPs in sleepy little towns.

When things get competitive, then onpage optimization has much less of an impact.   Then, great content and great links are much more important.

There are many ways to hide things and Google's response to them can be different.    If you want to learn if Google is viewing and indexing, then place some unique text in the hidden area and search to see if it is findable.

Also, if content is hidden, google might decrease its value in search.  We had visible content that was placed behind a hidden... Google still indexed it but it was almost worthless for pulling in longtail traffic.  We brought it back out into the open and it (after many months) returned to its former SEO value.

We run "in house" websites.   That gives us knowledge of many other businesses in the industry.   For businesses that we don't know, we can easily check professional credentials of individuals and companies.

Google is able to check professional credentials of individuals that include:  government issued licenses, professional registrations and memberships, college degrees, wikipedia articles, awarded patents, registered copyright. and publication history in professional journals and on industry websites.

For companies, Google can aggregate the professional credentials of its staff, company certifications such is ISO (and similar), stock exchange listings, wikipedia articles, awarded patents, registered copyright.

DA is a very primitive tool in comparison.

I my opinion, DA earns zero and position on the page earns zero.

The respect of the organization represented by the website and the relevance of the linking page to the target page are more important.