Welcome!
Keep in mind there's no algorithm pushing things on us here, so it's best to seek out and subscribe to as many communities as you have interests. :) If there's a niche community on Reddit that you miss having here, consider making it yourself. Also, the most you can post and comment the better!
One thing that's nice about the Fediverse compared to corporate social media is that there is far less bullshit, fewer ancient reposts by people pretending to post original content, almost no AI slop, etc... It's really nice, in my opinion. Reddit certainly has a larger quantity of stuff, but I think modernly the quality has become quite low.
Nice to have you.