You have nothing!
If you ever talked to a lawyer you would know what it would take to close an account from a third party and there is no way youtube will even care to take a look at your request if you don't have a solid copyright claim on all videos.

This whole thing is pure BS just like your other service about banning reddit accounts, lol...what?

If you want to prove you're the real deal, good, delete this guy's channel as proof:
https://www.youtube.com/@metatronyt