Hi @MorgothSauron,
In Discourse (our forum software), only new users with a very low number of posts can delete their accounts.
As an alternative, you could message one of our forum administrators (see: About - Caddy Community), who can anonymize your account (the effects of which are outlined here: Anonymizing Users in Discourse - announcements - Discourse Meta).
As an extra step we could also possibly suspend the account, removing its ability to log in.