the first step, repainting lines on roads to add (ideally protected) bike/scooter lanes, is a large but imminently manageable project that can get done quickly. while that's happening, you direct various agencies to favor bike/scooter parking over cars, perhaps introducing necessary legislation to that effect. the harder and longer changes are removing/reducing over-zealous zoning, deceptive environmental lawsuits, and overly-specified building codes. it won't happen in a few months, but a lot can happen in a few years for a motivated electorate.