You were already warned about complications on your other thread by another long time Linux user.
I will not waste my time trying to diagnose a problem a new user created themselves (especially when they aren’t even up front about what they’ve done).
We didn’t make the changes to your system, you did. We’re not physically able to do a hands on diagnosis of your machine. The only one who can do that is you.
Playing with your system is fine, that’s how you learn. Just don’t expect others to come running to your rescue when your experimentations cause regular breakages.
That’s what backups are for. Learn to back your system up (not expect everyone else to correct your mistakes for you). Learn to help yourself and quit playing the victim.You reap what you sow.