Lost all permission to change anything on my laptop, how to go back?

Question

I turned myself into a guest account, by changing my status from administrator to device owner. Now I can't change anything, not even reset windows, not change account, not run /netplwiz. To everything it says I have to log in as administrator, but there's no administrator now that I'm guest

Answer 1

1) Press Shift and Restart from the power icon (together)
2) Select Troubleshoot.
3) Go to Advanced Options.
4) Select Command Prompt.
5) Type "net user Administrator /active:yes"
6) Hit Enter.

Answer 2

Thank you. I would have loved to try this, unfortunately I already reseted