Yeah all python application’s need to rebuild to 3.9 compatibility… thats most with aur related stuf.
you can try two things boot ‘directly’ into tty or chroot.
boot directly too tty ,
systemd.unit=multi-user.target
you add that to grub, when you are in grub add e , en add this to the linux kernel line
or chroot, you need a usb with endeavouros…
would try first, de first one.
optimus-manager must have a rebuild to the next python… you can use git version eventuel, rebuild is importand