Grub 2:2.06.r322.gd9b4638c5-1 won't boot and goes straight to the BIOS after update

How to convert to systemd boot: [Tutorial] Convert to systemd-boot

Converting to refind typically just involves installing the package and running the command to install it.

Switching bootloaders is probably not a good option for you right now then. There is always some risk in doing so.