I’m happy to help provide answers on my fields of interests but they are pretty much dead on Lemmy for now, it’s a chicken and egg thing.
It doesn’t help that because we don’t really have good algorithms, my feed is dominated by generalist topics, memes, news and tech stuff. So even if I subscribe to smaller communities, if I don’t intentionally go visit them they’re never in my feed.
We need to better surface posts from smaller communities by having a weighted algorithm so that your feed is a mix of big and small communities.