Looking at your technical knowledge and the state your system is in, it’s going to be easier for you to read this:
then:
Boot a new Manjaro .iso from USB
backup your data
reinstall
be more conservative as to what you do with the new install until you learn more
Nope, I’ve been in the same situation as you: I messed too much with themes and abandoned software and installed from source and … and then couldn’t figure out what I did any more.
