Post, Talk and communicate with people.
As you use the Fediverse you will slowly see regular people pop up, talk to them, especially those you've enjoyed talking to in the past or have something interesting to say to.
The Fediverse is about communication and sharing ideas so do that, This can be done through posting in communities or commenting on posts in communities / topics you are interested in.
It's all good, yeah it's a little different than your traditional social media as instead of going for reactions and pushing out content you actually need to communicate and talk instead of just pushing random posts more of the time to grow an actually connected audience