Change the Jetson runlevel to non-GUI to switch off the gnome display manager (or other DM) to free memory.

Instead enable graphical login with X2Go.

# Temporary
sudo systemctl isolate multi-user.target

# Permanent
sudo systemctl set-default multi-user.target

https://teawiki.net/doku.php?id=workshops:nvidia_jetson:xavier_nx:start