First of all a mention needs to be made:
***DO NOT REJOIN DOMAIN***

i will not talk you into this too much so let’s get ready to solve the problem:

1. you need to reset the computer password using netdom.exe

netdom.exe resetpwd /s:server /ud:user /pd:*

2. you will need an local administrator account to do this and if you are like me, a security freak and u have disabled all local accounts use something like the link below to activate / reset

https://pogostick.net/~pnh/ntpasswd/

Good luck!