Solenoid is where I would begin. A lot of the auto parts stores sell junk so be careful when buying one. This would be what I would buy:
For 1993 there are two solenoids. It's essentially a double-relay.
Take a jumper wire and jump the small upper terminal to the post with the batter connections and see if the car will crank doing that, vs bridging the two main terminals.
What i mean by that is touch your screwdriver from here to here and see if it cranks healthily. If it does, this may be an ignition switch issue
Just for reference the wiring diagram. The above relay would be labeled "starter relay"
Take a jumper wire and jump the small upper terminal to the post with the batter connections and see if the car will crank doing that, vs bridging the two main terminals.
What i mean by that is touch your screwdriver from here to here and see if it cranks healthily. If it does, this may be an ignition switch issue
Just for reference the wiring diagram. The above relay would be labeled "starter relay"
That part has quite a few bad reviews. Multiple people had issues with the plastic cracking when they were tightening down the terminal nuts.
Here's a Motorcraft option (not saying it's better necessarily, but it does have fewer bad reviews, and more good reviews... for what that's worth!)....
And post #5 goes down in flames. Touche!
That's the truth. Unfortunately.