hey aminiel,
Can u change my nickname back into avicii, if you don't can fix it. Can you tell me then something how i can do it?
Oh my nickname is allready change after 30 days i'm in that region. I don't want this nickname annymore

Use the options page to change your nickname. You will be able to change your nickname again 30 days after you changed it for the last time.

There is no bypass to change it sooner. Next time, think a bit more before making a request.