Comment by pferde

If you actually take the time to look for posts and communities about things you care about, you'll find more than enough of interesting people. It's just that there is no algorithm to feed you content, you have to be active in looking for it, at least initially.

I'm not necessarily saying you made this mistake, but plenty of other people who dip their toe in the fediverse do this - they get in, find nothing in their feed, they shrug and forget about it. A good start is to search for a few hashtags that match your interests, even add a follow for those if you see they're active, and soon you'll start seeing interesting people. I've been on there for years, and I'm always amazed at the small niche discussion threads I find.