I just re-read your post. So if I am reading correctly, you must be accessing the Hassio command line through a physical monitor and keyboard connected directly to your Pi. If you have access to the Hassio command line, you have everything you need.
hassio snapshots will list all of your snapshots. Take note of the “slug” for the snapshot you want to restore.
hassio snapshot restore -h will give you the parameters you need to pass to restore a given snapshot.
hassio snapshot restore [slug] will restore the snapshot in its totality. You may want to check the flags options available if you don’t want to do a complete restore.
Advice about checking your homeassistant.log still applies. No use doing a restore if it isn’t going to fix it.