If you are asking for assistance, you have not done so very well. There is no diagnostic information of any kind in the thread. You mentioned you read a couple other topics that sounded like your issue, but you did not link to them. Your description of the issue is somewhat meandering and hard to follow.
Honestly it sounds more like a whinge than a request for assistance. If it is a whinge: okay, fine, but it shouldn’t be in the Issues & Assistance category then. It should be in…I don’t know, Feedback I guess.
If you do want to get your system back up and running, you will have to get a USB stick, boot to the live environment, and start putting together some information for the thread. See how far along you can get with this process, for example, and paste some actual information into the thread as you go: How to chroot Garuda Linux
The fact that the Btrfs filesystem is recognized would suggest it is not corrupted. Perhaps, instead, it is your EFI partition which has failed. Or maybe the filesystem is fine but the Grub configuration files have been accidentally removed–this can cause the system to boot to Grub rescue.
You weren’t running an update by chance? What you are describing sounds a lot like a system which has been rebooted before an update has completed. Even BSD will break if you reboot during an update.
This seems unlikely. Even if you were not able to repair your system from the live environment, if you can at least mount the disk you can easily transfer your files to another system.