1. Avoid dangerous places ( most cities).
2. Lock your doors, keep windows rolled up.
3. Maintain Situational Awareness- you ought to know who is behind you, who is moving around on foot. Look at faces. Stop signs/lights are to the place or time to put on make up, check phone etc.
4. Maintain a car length of space in front of you ( you can’t control space behind you.
5. Have a plan even if minimally, to move your vehicle if someone attempts to access.
6. If armed, have it accessible. As a Lefty, I cannot effectively draw while seated and belted, so my weapon goes into a RH duplicate screwed to the lower dashboard for right handed use. If I was a Righty, I would do the same. Or, better yet, have two weapons, one for car mounted storage and the other on your person, have a secure means of storing the car gun when you are not present ( lock box bolted to the floor etc).
7. Practice or at least simulate weapon handling (safely) from inside your vehicles ( inside a closed garage, cleared weapon)
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8. Avoid cities did I mention that?
You forgot: avoid registered Democrats.