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It probably happened when I was messing with SSDs. I wanted a smaller one to be root and a bigger one as home.

Edit: Kind of happy that i managed to break something and fix it.

I managed to find a problem and fix it. The problem was that /etc/kernel/cmd had the wrong UUID. Thanks for giving advice about initrd and bootloader reconfiguring, might not have found a solution without it.

I think I found what changes root UUID. When I used dracut-rebuild all entrie UUIDs changed to the wrong one. Now I have to find how to stop that.

I used gparted, blkid, checked fstab and by-uuid dir and no partition or drive had that UUID.

Will have a look.

I used arch-chroot. I mounted efi to efi dir with mount and used mount -o subvol=@subvolname to sub vol dir. Just incase i will reinstall nvidia drivers when booted normally. I will read about initrd. Thanks for all the info.

I have systemd-boot.

[You are right. In systemd-boot entrie it is used for root uuid. I should replace it with my root uuid right?]

Edited entrie to my root uuid and it boots. Thanks for helping me.