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
I'm upvoting posts and comments, and I'm sporadically commenting in other users posts. But I'm still getting confidence to post things cause everything is new and I'm kinda insecure with the possibility of messing things up.
Understandable, but you should just get one thing: this is like Reddit, a lot of people don't even read OPs name, so you can mess up as many times as you want and learn from it pretty safely.