Mistakenly done brightness zero

brightness is zero.
nothing on screen.
what to do except reinstalling os.

Hi there, welcome.
Boot from a live USB and use the chroot button in the Garuda welcome.
This will give you a terminal where your are root in your installed system (not in the USB one).
Then you could try following this:
https://wiki.archlinux.org/title/Backlight
If your brightness is not yet zero when you are in the grub, you could try booting to a tty instead of chrooting. Check on the internet how to do it. In a few words, when you're in the grub press button E, go to the end of the line starting with linux and add 3 (with a space before), then ctrl+x.

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