Many lemmy communities started three months ago with the reddit exodus. Comparing them to subreddits with years of content will leave you disappointed.

What you are doing here (submitting a post) is what it is going take to make that change.

That said !achievers@lebowski.social has a decent size feed and !comicstrips@lemmy.world is good too

I also really like !gameart@sopuli.xyz and it is on the best instance.