I created a community specifically for the Commodore Plus/4 (and related such as the C16), as it needs more love! Also retrolemmy.com is underutilised for actual retro communities.
Hello! Not sure if you’re an admin or anything exciting on that instance, but I have a hobby restoring antique radios (personally, my favorites are from the 1940s) and I’ve been meaning to start a Lemmy community for that. It’s a little different than the stuff on retrolemmy now, but maybe that would be a decent fit? Happy to keep it on the major instances, but I like the idea of helping each instance keep some kind of theme!