By replacing the starter so many times, you've made your problem worse. Look at the wires that go to your starter. There are 3 wires, power, ground and a third very small wire that connects with that black plastic connector. If this wire doesn't make a good connection, your car won't start. My car was randomly not starting especially when I was at the track and the car was hot. I would get out of the car and push that connector on tighter and car would start right up. Eventually, I used zip ties I think to make sure it stayed connected.