It looks like you found the steps to delete your account. For others that might search for this, you can find the steps to do this in https://support.atlassian.com/atlassian-account/docs/delete-your-atlassian-account/#Delete-your-account
From that page:
To delete an account:
Access your Account settings at id.atlassian.com/manage-profile.
Select Account preferences.
Navigate to the Delete your account section and select Delete account.
Before you delete the account, carefully read what happens to the deleted account.
Select Delete account and confirm you want to delete it in the confirmation dialog that appears.
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