Ignition Switch
WARNING: This page is about a different car, the 2018 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
After testing starter solenoid and relay, test ignition switch and wiring. Refer to IGNITION SYSTEM - SERVICE INFORMATION - JEEP CHEROKEE or Wiring Diagrams for more information. Check all wiring for opens or shorts, and all connectors for being loose or corroded.