In the badges section it says
Regular: Granted recategorize, rename, followed links, wiki, more likes
Can I rename my journal myself? Or change categories of threads? Like putting something from the lounge to Questions?
Or is this just a feature of discourse that wasn’t implemented?
I’m asking because I did notice some Journals changed their name without asking a moderator.
i don’t know if it’s a trust level thing, maybe it is… but you’re able to change your thread name for a certain period of time after you publish it, not indefinitely
I wonder how to increase trust level. 
activity and how often you log onto the forum
I think you are able to edit your journal name with the Regular badge.
Edit (4 hours later):
I reread the OP question. Yah, you can change topic name, change categories of threads without tagging a moderator. The Regular badge is for fairly active posters.
I had a Regular badge one time and then it went away due to inactivity.
I’m here everyday and been fairly active for a year now. I became arch alchemist in under a year.
These are the requirements to become a regular