Make public transport convenient, affordable and pleasant.
Accept that sometimes people NEED to use cars. I travel to work by bike, but I find that towing my caravan really does require a car. (On the other hand, I never fly anywhere). Sometimes I am injured or ill, and use my car. Sometimes my dog is injured or ill and has to be driven to the vet. Sometimes I have to carry big or heavy things.
Look, what we need is a holistic "carbon credit scheme" - cars are by no means the #1 villain. What about farting cows? What about shipping stuff from Korea? What about great big "look at how much I earn houses" with their great big heating bills. What about swimming pools?
See? It's not as simple as demonising car drivers and, frankly, I'm sick of being scapegoated/milked as a convenient cash cow.