Welcome back to you too Fuchsia! From what I've noticed it appears you used to be on another account, but given how long you've been away I guess a fresh start wouldn't be too bad.
Anyways, based on your interests you're definitely in for a treat since you're interested in some of the most popular sections of the forums - ROM Hacking, Challenges, Battling & Team Building and Trade Corner. Those should pretty much have all your interests covered, and due to their popularity they are always booming with activity so I'm sure you will make some new friends around there. There are lots of other sections to consider visiting as well, so do explore and see what catches your eye!
While PC looks different now compared to the last time you were here, I'm safely assuring you will be able to re-adjust and hopefully have as great of an experience as before. Anyways, I'll see you around and do try to stick around longer this time!