I joined Lemmy like a lot of others, when Reddit shut down the API. I soon went back to Reddit but also stayed on Lemmy.
The big problem for me with Lemmy is it’s still way too small to use it the way I use Reddit. I’ve subscribed to a whole bunch of communities equivalent to the subreddits I read and comment on. On Reddit those subreddits have a few hundred people active on a daily basis, whereas on Lemmy they’re lucky to see 1 post and 2 comments a week.
Small communities and real discussions were always what I liked about Reddit, never the big subreddits with millions of users. For now, anyway, Lemmy’s communities are just too small to foster those discussions (on the topics I’m still on Reddit for, anyway; there’s plenty of politics here obviously).