For example, I used to follow a lot of subreddits for individual YouTube content creators, however, Lemmy doesn't really have the size or culture to support this currently.
The only reason I check Reddit with any regularity anymore is for content local to where I live. There's a few communities on the fediverse for my area, but with only minimal, sporadic activity.
I would love to see more activity around fostering animals, particularly cats. I started !fosteranimals and have participated over at !fosterkittens, but it seems there's not many of us so far.
Edit: No clue why I can only get 1 of the 2 links to work correctly, but FosterAnimals is on kbin.social, and FosterKittens is on lemmy.world.