Hi there, welcome!
There are being several similar issues recently, in relations to recent kernel an nvidia driver updates.
My initial suggestion would be to restore again from snapshot, install the linux-lts kernel
sudo pacman -S linux-lts linux-lts-headers
and try updating again (the system and the built-in nvidia drivers provided by the Garuda Assistant / Installation)
In case of further booting issues, you could try following this tutorial.
Computer doesn’t boot, boots to a black screen, or stops at a message
PS: please always provide your inxi -Faz according to the new topic template