I'm a typewriter fan. 15 days ago, I asked the admins of lemmy.cafe to be nominated moderator of !typewriters@lemmy.cafe which was abandoned and they quickly and kindly answered positively.
I'm not sure it's a good strategy, but for a month and a half I post links to all typewriter-related blogposts, YouTube videos and podcasts that appear in my RSS-feed, and I have a handful upvotes for every post, so at least a few persons find them interesting. And three other persons published things since I begun, even if each one published only once; it's more than in the months that preceded my implication. It's still not much, but I'm quite happy with the result for now!
I also created !typecasts@sh.itjust.works, which is a home for things published with a typewriter but not necessarily about typewriters. It's even more niche than !typewriters@lemmy.cafe, nobody but me ever published, but it works I guess.