That's impossible for the moment.
ref to #109 #177
You can delete your account now (since https://github.com/tootsuite/mastodon/pull/3728)
@saper I can delete my account since #3728? How?
From settings.
Where? I'm looking in Settings. I don't see it.
The Security page, together with your password and e-mail address settings.
Found it. Thanks!
Can you speak to what this user action actually does across federated sites?
Send out a Delete->Actor activity to all known inboxes, and removes all data except a reserved username locally.
How do I change my username?
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How do I change my username?