Hi Catmat!
Unfortunately, we can't allow you to make a new account 8c We haven't allowed anyone to do it in the past either, due to it being against the rule of having more than one account ;v;
If you want to change your username though, the only way to do it is through a Forged Birth Certificate ;v; It's a bit expensive ;o; 250CP/200mil aprox/$25USD
I appreciate you asking first though! ;v; If you do have more questions about this, feel free to rmail me! c: