Suddenly lost my admin status

I have a Macbook Pro M1 running Sequoia 15.1.1. I only have one user installed on my Mac, and this user suddenly seems to have lost its admin status. Looking in system prefs shows that the user is now *"standard"*. I have no clue how this could have happened. I did not try to rename my user, or anything like that. I presume this would work: 1. Erase the Macbook completely 2. Reinstall the system 3. Create a new admin user and log in 4. Reimport the old user from Time Machine backup with Migration Assistant 5. Give back the privileges using the newly created admin 6. Keep both admin accounts for safe measure Is there a way to create a new admin from my current state or a shortcut to getting my user re-added to the admin group membership?