Once you've created your account (with whatever username you put there), it's set. You can't change it.
The only thing you can do is to create a new account, using a different username and don't respond to any posts this one. One note, if you opt for this, you must change your email on the current account (a fake one works), and then create the new account using your correct email. You can't have two accounts on one email.
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