There are some really fun images being generated over there lately with a lot of variety!
I like random art popping up in the sidebar from time to time on kbin. I'm not actively following but have seen some fun imagery occasionally pop-up from:
So maybe take a look at those as well if they sound interesting.
I'm also subbed to a bunch of other communities, but not interacting with them very much; no content of my own to post right now and they're either (mostly) dormant or the people who are posting are not posting the sorts of content I'm interested in engaging with currently (but I might be interested in the future, so I subbed):
I joined that last one to hopefully find other interesting communities as well.
Occasionally I'll interact with other communities when they pop-up in the newest threads feed on kbin.social -- e.g. https://lemmy.blahaj.zone/c/196 or other meme communities. Sometimes people post things like technical problems they're struggling with in https://programming.dev/c/cpp or wherever and if I see the threads and have time I try to answer them.
If you find a community that looks interesting but is dormant, start posting regularly (like maybe once a day). If you get upvotes or comments, there are still people around who just don't have content to interact with!
Edit: I should also add for the off kbin/lemmy part, I'm also on Hacker News (news.ycombinator.com) under a different username -- although that has a tendency to piss me off, so I'm cutting back on reading it.