You can't. The account information is required for audit purposes.
If you contact sales at atlassian dot com, they can delete an account if you've never had a licence, but if you have, then they are required to keep a record of it.
You can (and should, if you don't need it), change the email to a dead email (email@example.com something), then change the password to a random string and simply forget you ever had it...
It's officially Tuesday, which means it's officially time for another tip to help you better navigate this space we call the Atlassian Community. 😄 I got a great question from community member, Sa...
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