I really love community-driven social media like Reddit. Lemmy feels… too small. I really loved that Reddit let me jump into any niche hobby, and instantly I had a community.
Please note: you only ever had something like that with Reddit when it had already several years of operation. Even today, you can't jump instantly and find there a community for any niche hobby.
As with all these things: be the change you want to see. Add content, or else it won't be there when you or someone else comes in.
(There's also a feel that Lemmy is "small" becaue it's not only one place and all that)