There is a terminal block on the right side fender well, in the engine compartment. Forward of the battery and just behind the coolant reservoir. That should be the first thing to look at. Then check the cable to the fuse box, which is on the firewall in front of the driver. If you lost power to everything, it pretty much has to be one of those connections or associated wiring.

Almost everything is powered from the fuse box. But the starter and glow plugs are not. By chance, does the starter work? Or does the pre-glow indicator lamp come on?

Something else to keep in mind. If you can get the car started by hotwiring it, it will run without an electrical system. Of course, no lights, a/c, power windows or windshield wipers. But you might be able to get the car home.