Might need a reinstall, since /etc/X11/xinit/xinitrc isn’t found.
Then:
sudo cp /etc/X11/xinit/xinitrc ~/.xinitrc
See the Arch Wiki:
https://wiki.archlinux.org/title/Xinit#xinitrc
nano ~/.xinitrc
Append the following line to ~/.xinitrc
exec startlxqt
You might want to sudo systemctl disable sddm.service and use startx to get into your DE then…