If you've found 4 broken wires there's a chance there may be more. These wires are so tightly packed in the rubber they are prone to breaking. I would recommend stripping the door card off and using a multimeter check continuity on all cables from the plug on the end of the door to the relevant plugs inside the door, giving the rubber but a nice wiggle each time to make sure. Failing that, plug it all in and use multimeter to see if power is getting to window motor when button is pressed. This will eliminate any wiring and also the switches. I think the Windows are powered together through the bsi so if passenger works then so should the drivers.
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