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The starter itself has only 2 wires for signal 12v. I would isolate them and test each individually.
In other words, the starter isn't turning the engine, so now for diagnosis purposes you need to first verify that the starter is indeed able to turn the engine. Do so by manually sending 12V to the solenoid/starter (Use a thick piece of wire to "jump" the starter) just to verify the starter actually works the way it should. (hear "click" when turning the key, but when you go under the hood 5 seconds later and manually jump the starter it spins normally)
Once you verify the "large lug" (main 12V source) to the starter is indeed healthy/intact (because the starter always turns the engine when you manually jump the solenoid) you can ignore it and focus on the smaller wire- the one in the harness. Follow it to wherever it goes and replace whatever along the way you find damaged/aged. A temporary solution is a simple button, you could use a relay to power it (so you dont have to run live 12V through the car, just send a ground from a button to a relay)
Other info:
From experience, it sounds like the problem is battery/terminal related. Verify you have the thick ground to the intake manifold and battery tray attached. And then, suspect a weak battery. Are you running a "small" battery? or an old one? Barrow a fresh battery or a jump box and try that before de-looming your harness looking for wiring issues.
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