You can use update, which is a shortcut to garuda-update.
Thread here about that: Update Vs Garuda-update - #4 by TNE.
It allows a lot of manual intervention to be skipped, and things to be fixed before you even know they would have broken. You can see some examples of that here. https://gitlab.com/garuda-linux/packages/stable-pkgbuilds/garuda-update
I can’t speak for using timeshift anymore, it is probably no longer officially supported. You should consider BTRFS Assistant Btrfs Assistant 1.0 is nearly here. If there’s some missing functionality in timeshift, you should communicate what specifically that is.
If you are able to restore an old backup still, why not restore that, and upload or save your important data somewhere else, so you can avoid restoring to an old medium.