I'm not sure but I think you can't right know.
But maybe @brugeman will remove your user from the nsec noauthd to let you reuse your pseudo 

 That's the beauty to selfhost nsec.app, you would manage your account by yourself 😄  

 Try this nostr:note1059p6ulldm7frlcyyf4lq4fvfpc2e9tkrsvpvwzxadfsrk9xnutqjdvt6z 

 Impressive work you are doing right on nsec.app!