I have a company that sells fun Rye Whiskey accessories and barware but I also have a number of other domain names that would be complimentary that are current just pointing directly to the site. For example the root domain is RyeCentral.com but I have other domains like RyeWhiskeyGifts.com pointing directly to the root domain. Would there be a better way to take advantage of the alternative domains to increase DA or SEO keyword rankings?
If there are links pointing to those other domains, then maybe. Otherwise no.