We can start by mandating EVs-only for vehicles priced $100,000 and higher, and lowering that threshold by $10,000 yearly. We entirely overhauled our manufacturing in WW2 with much less technical capability than today - we just need the political and social willpower (which I guess war provided).
Electric busses are already here. Those other uses require minimal levels of fossil fuels in the scheme of things.
Public transit is not attractive because its not point-to-point, and you have no control over the other passengers on your ride. Autonomous minibusses with demand-driven routes, private subscriptions, and passenger reviews are the solution. Or, just plain old electric scooters if we can get rid of enough street parking/car lanes and install bike paths.