Right now the user count Lemmys is comparatively tiny when held up against reddit - but the user count isn’t the thing that makes a social media site, it’s the engagement
So even if you’re used to lurking, try to get a little more active! Post memes, vote on posts, talk in the comments, whatever!
If people come here and see activity, content, and discussions, they’re more likely to stay and contribute their own - if they come and see a ghost town, they’ll just go back to reddit
A lot of the subs are already up and running (HydroHomies, CasualUK, Solarpunk, Guitars, 196, FuckCars, etc) under their old names, some with variations. When you search the entirety of Lemmy, give it a moment because it takes a few seconds to retrieve.
You can subscribe/unsubscribe with reckless abandon!
(And search your favorites often, there is a steady flow of new communities being created right now.)