Very Important, Please Help

I had an old account that I very naively put my name as the nickname (along with surname initials)

since then, I deleted the account, but I think the actual "incriminating" posts didn't go away. I also changed a ton of emails.

I can't go to "forgot my password" because of that.

Could someone please help me by changing the name (obviously I won't say the user account here) I will send the name and account through a private message, and if necessary with other information to prove it was me.

Thank you