Thread:Sannse/@comment-39518762-20200601120516/@comment-44807868-20200601132100

Having a look at Special:Log/rights there, it looks like you accidentally demoted yourself to thread moderator. That user indeed can't promote you as they don't have bureaucrat rights, which're required to modify others' user rights.

Unfortunately, Sannse currently isn't a staff so she can't help you. Instead, you may and let them know of your situation!