To use new domain name or not?

[Nanook1]

I've had a web site since before most people knew what a web site was, aeroconsult.com. It has a page authority of 30, domain authority of 21, and 21 root domains that link to path. The problem is, I am not getting many organic hits, and I am wasting a lot of non-productive money on ad words.

Because this site is over 20 years old, with a few rudimentary modifications, I decided to create a totally new web site that is modern and that has a regular menu, pictures, etc. It also has a domain name that more accurately reflects what I do. I am an engineering consultant working in the area of RF and microwave design and development. I design rf and microwave circuits and systems for clients. Those clients range from individual inventors to start-up companies, to large (and, yes, sometimes) corporations, including some aerospace companies. But, I do not design rockets, space ships, airplanes, or other things that an aerospace company does. I get a lot of organic hits on "aerospace consultant", "aerospace consulting", "aerospace design", etc. But, those are useless to me, since that is not what I do.

So, I designed a new website. It is still under development, but it is out there at rfandmicrowavedesign.com. Clearly, the URL is appropriate to what I do. And, all pages have my company name, Aerospace Consulting LLC. But, even with Google adwords, which I just activated for this site yesterday, I am not getting good results, especially when you look at the cost of the CPC.

I plan to keep my e-mail address, that is tied to aeroconsult.com since it has been out there for over 2 decades and that is what my old clients know. But, I am wondering if I should move the new web site contents to my old domain, aeroconsult.com because of the domain authority, page authority, and links?  Or, am I better just leaving the old aeroconsult.com web site out there and concentrate on the new web site with the new domain name?

Both web sites have 1 or 2 organic search results in the top 10, although the only organic search result that really relates to my business is "wireless design consulting" which is #8 for rfandmicrowavedesign.com, although I think it is something like #10 for aeroconsult.com. All other organic search results are less than 50, which is, of course, useless. (Although, #8 for rfandmicrowavedesign.com is pretty impressive since it has only been live for a couple of weeks, vs over 20 years for aeroconsult.com.

Anyway, I am looking for advice. Should I scrap the old aeroconsult.com web site and replace its contents with the contents of rfandmicrowavedesign.com, or should I leave them both active for at least a while? I plan to continue to use the aeroconsult.com domain for e-mail since it has been out there for so long. I guess the real question is whether I would gain lot by putting the clearly better content and structure of rfandmicrowavedesign.com on my old, established, aeroconsult.com, or whether I should concentrate in building up organic and paid search for rfandmicrowavedsign.com.

[MichaelC-15022]

While it might be questionable, throwing away a well-aged domain, it sure sounds like it's causing you some other issues, including bounce rate issues for people who find you simply because of partial domain name match against their queries.

I'd be inclined to take the hit on domain age and move to the new site.  301 redirect the old site's pages to corresponding pages on the new site.  You can set up your old email address to forward to your new one, so people using the old will still get to you fine.  I wouldn't use the old email address on the new site, as you'll get people ignoring your emails because it's not from a site they recognize.