Unable to login with Google email

I have lost access to my gitlab account.

  • Reset password not works, I don’t get any email.
  • Google authentication not works (Sign-in using Google auth failed Email has already been taken).
  • Github authentication also not works (same error Email has already been taken).

The error said
“If you are unable to sign in or recover your password, contact a GitLab administrator.”

Buy how I can contact with “GitLab administrator” from a free account?