You should contact @ernest I think. He's the admin of the instance. Though, I think he's on a christmas break with his family right now, judging by his inactivity over the recent days and what he said in the last devlog.
If it's just about preventing your access to your account though, I think setting a password that you don't know would do the trick. Maybe set half of it yourself and have someone else contribute the other half, so neither of you knows the full password.
I do think you're putting yourself down too much about the quality of your posts. Referencing a comment of yours here. I've looked a bit through your history and didn't really see anything out of the ordinary.
And, when someone’s a shitty poster like me, don’t m people usually want those kinds of people to delete their accounts?
Not really. If the account is a problem for you, sure, get it deleted. But no one's wishing for you to delete it.