Well if you did not use VPN that's the reason of ban.Even if its just a mistake for once.Because as i know OSU automaticly bans you if the distance is too far in a short amount of time.
I do not use dejavu on my main account i did not get ban on my new pc for 3 years.The question is if i make an another account do i have to use my main with dejavu and vpn too ? or after logging out from the smurf can i do everything as usual ?