Actual account deletion is not possible at this time.
If you wish to start over because you want to play as a different class, you can tubmail a moderator and explain your desire. We can ban your account and have you start again under a new class. If you’d like to reuse your e-mail address, be sure to change your current one before tubmailing him.
Note: We’re more likely to allow you a restart if you’re around Level 5 or lower. Also, we would frown upon a player requesting to go through this process multiple times.
Note: If you wish to start over because you don’t like your build, you can simply use haxlrose to reset your stats.