Multidisabler seems to be the main reason why I succeeded in booting it up. Without flashing it, it gave me bootloop on logo.I DID IT!:
1 Download and install Twrp(official)+vbmeta.img (with Verify Boot disabled) + Rom + Multidisabler + Magisk apk (install it from Twrp)...
and you will get Twrp+Root+SELinuxEnforcing!
Obviously make a backup of your data(you need to format Data partition on Twrp if it is encrypted!)