Starter clicks using the key, engine starts by jumpering the relay

Yes, the key started the car fine until several months ago. I haven’t been driving the car much, so I hadn’t been worrying about it.

I didn’t make any changes just prior to the problem arising, but changes I’ve made have been adding a new engine harness, new starter solenoid (because I thought the old one was bad, turns out it wasn’t), new wire from the bulkhead to the battery post on the solenoid, new ignition switch (after this problem started). That’s really about all I can think of that would be relevant.

I will say that the problem came on gradually, and I could get it to start with the key by jiggling the wires under the dash at the steering column. A couple months back, I pulled the steering wheel to replace the ignition switch, and checked the wiring for any damage - couldn’t find any.