Just decent quality content for various topics which aren't politics or tech. For the good of increasing the size of Lemmy, I think everyone ought to find a couple things they're interested in as hobbies and just dare to make content about them.
Lots of niche communities have the problem where no one posts because no one posts. At some point, you have to just pull the ripcord and start the darn thing, even if it takes a while.
I'll hop into inactive communities for things that interest me, and after posting for a bit, others eventually show up and start commenting/posting too.
I'm trying to do my part in my niche, I'm still 90+% of the posts. I don't care tho, I'll keep posting for all 25 of us as long as I have content to post.