Starting probelms help please

That is what I thought before I changed out all the parts all the bulkhead connections are clean and test good. I have checked the engine ground and wiring harness ground any other grounds I should be checking? I also removed the seatbelt interlock and clean alll the wiring and connection even though I don't have the seat sensor installed on the car. Car was working fine with the probelm happening once a month or so until recently.

Thanks