Snaps… okay if you want that you can use… but not 100% recommended on archlinux/based
You can see /efi is almost full… in case it is to much to install LTS kernel there, as you only have 512MB with systemd-boot kernels will be installed there.
So go remove LTS kernel it will not be able to build initramfs images to this small ESP.
sudo pacman -R linux-lts linux-lts-headers
and try rebuilding initramfs after this: sudo reinstall-kernels
And if system is okay again (basically) go read this:
switch to X11 session (if you were using X11 before)
resolve possible missing packages:
eos-packagelist --install "KDE-Desktop"
reboot and check how it goes.