These domains are all ones that I've procured myself on sites like GoDaddy Auctions. I've recently bought a lot more aged domains than I have time to build niche sites for, so I'm listing them here.
I've included all the relevant information about these sites, including my original thoughts on what I might do with the domains. It could be to build a new niche site, or to use its backlink profile and 301 redirect it to your existing niche site.
Was previously a Content Writing Services Agency. Still ranking for many keywords for content writing and services.
Was a website that focused on designing and building indoor environments for the home and office. They developed detailed programs for our clients that reduce costs, improve wellness and enhance productivity through environmental improvements like indoor air quality and water quality.
Previously a comics review site and podcast. There were many reviews on the latest comics when the site was live. It seemed like their podcast was pretty regular too. Cool plus is a link from marvel.com and it's ranking for many keywords and getting clicks (see GSC screenshot in the Details).