I've been one of the people saying "we don't need more users. we need quality over quantity" and i was wrong.
the way it's going, lemmy needs active users who post content sothat the network stays relevant. networks like the fediverse benefit from network effects and that means that if we have more users, that improves the value and quality of the fediverse overall.
So please, everyone, when you can, make advertisement for the fediverse in your personal area. Go talk to friends, make attractive stickers and put them everywhere, stuff like that. We would all benefit from it.
edit: source for the graph
it's activitypub thing so lemmy as well. you sign up on one server, subscribe to community on different server, mods of the different server will decide they don't like your server for any reason (e.g. explicitly because mods of your server didn't blacklist some other server) and you are out of that community. it sucks. imho something based on the old news system would be better (i.e. community exists independently and servers just subscribe to them or not).