You definitely need a new harness. I've had the camera apart but not have gotten into the wiring. If I were you search some you tube vids on the wiring for the gimbal. Or wait for a better reply. Hang in there.
That plug looks like it's still attached to the other plug. You need to get that plastic piece off. You need to take the top off the bird and replace that harness. Shouldn't be that hard but you have to have the right tools. See youtube as Phil56 suggests.
this one will be iffy.
if you don't have a micro solder you will do more damage with just a regular 25W weller or similar.
that plug needs to be soldered back on the OFDM board and then you will need a new cable where the wires are torn off.
bird needs to come apart and USB connector removed in order to replace that grey cable.