Ok the display-manager failed here…
Only startx will not work…
startx /usr/bin/xfce4-session
or
startx xfce
The reason: In your ~/.xinitrc file there no predefined session by default.
Normally you can just restart the display-manager:
sudo systemctl restart display-manager.service
sudo systemctl status display-manager.service
Your xorg log looks normal. It just don’t start a session, since none was chosen: