There really isn't a lot left. Have you confirmed that the ground wasn't damaged? If you look at the attached pics, (I had to break the schematic into several parts) you'll see that power goes via the switch to the body control module. When you turn the lights on, power is sent via the switch to the BCM and the out of the BCM to the park lamp relay. From there it runs to the front parking lights and finally to ground. Since you have no power at the light socket, it can't be a ground because you provide a new ground with a test light. So the problem is before. At this point, you need to work backwards. We know the fuse is good and has power, so the break has to be between the fuse and lights.
If I had your vehicle, I would start by checking and confirming that power from the fuse is present in the brown wire right at the fuse box. Note that it is provided by one pin but splits two different ways. If power is present, then you need to follow those wires all the way to the lights to determine where power is lost. Since you lost power on both sides, I would assume the problem is right at the box and no further.
Please let me know if I can help. It may sound strange, but I enjoy working through wiring issues.
Images (Click to enlarge)
Tuesday, December 3rd, 2019 AT 5:15 PM