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It depends.

If you are in Europe (or serve a European market), then you need to comply with GDPR rules. You'll need to specify how you use cookies, and how users can remove their data.

If there are nuances with how you use site data, then you'll need to speak to that as well.

Basically, if you collect data in any way from a website visitor then you need to disclose and help someone understand in lay mans terms what you're doing with it. If a generic/boilerplate privacy policy fits the need, then go with that. If you have custom applications, then have a lawyer review it for accuracy.

so the deal with subdomain vs domain is that you need to think of them as two separate sites; one is just living in the same database as the other. So when you moved the site over to a subdomain, it's possible you took a little hit but I don't think you would get penalized for having the main site live on the subdomain. It might come down to how you migrated and managed the redirects (did you map everything appropriately?), lost links because people were still referencing the old domain with the www subdomain, and a variety of other factors.

The .co ccTLD is actually for the country of Columbia, and isn't for "company" as some people may use it for. While there are a ton of spammy sites that use the .co because it's easier to snag an exact match domain, that doesn't necessarily mean you're being targeted for it. There are billions of websites out there. Having the .co and hosting in the US could send mixed messages, which may impact; however there's no real way to tell with any certainty.

Review your site migration, and make sure you have all the pages moved over correctly. Next I would check links. Reach out to people who are linking to you and ask them to update to the new domain. 301's lose a good percentage of equity passed, so it's better to get the full value with the correct link. Check local directories as well to make sure you cover all bases - those will need the URL updated. Finally, review your on-page optimization. Are you targeting the right keywords? If so, do you have the appropriate pages optimized and set up with good internal linking?

Check your traffic in analytics to look for specific dates it either spiked or dropped. That will also help you narrow down what you changed/what you need to change. Things like this are more detective work in the beginning to bring problem areas to light.

Start with that and let us know what you find.

Get links to the page - that's how to build up the PA. If the page isn't going to attract links on it's own, then link internally through other more authoritative pages on your site. That would push equity to that page to increase it's PA.

product specific keywords will be very competitive, because someone searching for those terms are very likely to convert to a purchase. You need to layer your approach a little bit when trying to drive customers in. The product pages will have the specific brand + model numbers, but then you will need to layer those under family/category pages that are more general. Those category pages should be optimized for slightly less competitive keywords (longer tail) which can catch users at the top of the funnel. Using remarketing can help bring those users back to the site at a later time when they're more likely to purchase.

Another thing to look at is navigation structure and internal linking. I would suggest running a tool like screaming frog or the Moz site audit to get an idea what might be going wrong. Fix the technical issues that might be holding you back. Screaming Frog is an awesome tool to get a really good idea what's going right, and what's bombing (tech wise). Some product pages may be more optimized than others, or they may have a better navigation path which could explain how they're ranking well (linked directly from homepage or another authoritative page). There's a lot of scenarios to why, but without knowing the site I'll say to take a good look with Screaming Frog. Pay attention how deep the product pages are within the site.

How are you segmenting your analytics reports? It might be possible that you're excluding locations or devices? I also wouldn't trust Search Console data to be accurate. It's delayed, and only a sample of the true traffic the site is getting. Use it more for research/help on optimization rather than using it as true data for the website.

If you really believe the page that's ranking shouldn't be and you have another similar or duplicate page, then I would set the canonical tag pointing to the original/better page you have on your site. If you're using the landing page for something like email only, and have another page on the site dedicated to the topic then I would use a no-index tag on the landing page to prevent it from being indexed.

Both cases will send a signal to Google to not include the landing page in the index.

If you can provide examples of what you're seeing, I think we could give you some actionable advice how to proceed.

An experienced SEO will understand both the things you're talking about, but also technical elements that influence site performance (from a user and search engine perspective). If you want to learn everything yourself and handle it yourself, that's fine but if you've got a business to run you need to really look at the opportunity cost of that. If you're really getting fed up with SEO companies not performing when you pay a large sum, why not hire someone in house to take care of that work? You kind of need to define what your business really needs, then find a company that truly specializes in that. Choosing any general agency may not yield the best results, especially if all they do is an audit and change a few onsite elements. If you're pretty much set onsite after working with a few companies, then find help with content development and outreach. Make content and resources that are useful for your potential customers, which will help funnel them into a sales page to convert into a paying customer.

If you're just looking for recommendations, you might be better off looking at the Moz recommended companies like Peter mentioned.

What if you use a concatenation formula in excel? If you have a list of all the old pages, and all the new then you could put them in separate columns and run a formula to fill in the required areas to the code. Seems like if there's a specific code that just needs the copy and paste touch, that could work in a pinch.