Account gone/Device unrecognised - What can I do?

YALL my account is literally gone, or so I think it is?

If I search my user I can still see it and the content I had uploaded in the past and everything else, however my friends can no longer tag that account on other videos and I also can’t access it. When I try to log in the username doesn’t show up and when I try resetting the password it says my device is unrecognised. 😔