Disabling gpu for headless mode

Hi all, this is my first post. I would use Zero 3W in an headless mode, just with a USB peripheral connected and WiFi. How can I really disable the GPU and other stuff that can reduce the power consumption and lower the temperature?
At the moment I’ve installed radxa-zero3_debian_bullseye_xfce_b6.img.xz
I’ve also tested the cli version but not boot the board.
I’ve disabled the lightdm service so the desktop manager doesn’t start and I manage the board via SSH. But temperatures are really high! I’ve changed the governor to powersave, and the board is running at 408MHz.
sensors reports:
root@radxa-zero3:~# sensors
tcpm_source_psy_3_0022-i2c-3-22
Adapter: rk3x-i2c
in0: 0.00 V (min = +0.00 V, max = +0.00 V)
curr1: 0.00 A (max = +0.00 A)

soc_thermal-virtual-0
Adapter: Virtual device
temp1: +60.6°C (crit = +115.0°C)

gpu_thermal-virtual-0
Adapter: Virtual device
temp1: +57.8°C

This is my system:
root@radxa-zero3:~# cat /etc/os-release
PRETTY_NAME=“Debian GNU/Linux 11 (bullseye)”
NAME=“Debian GNU/Linux”
VERSION_ID=“11”
VERSION=“11 (bullseye)”
VERSION_CODENAME=bullseye
ID=debian

Thank you very much.