This isn't rocket science at all. It just takes the political will to defy NIMBYs and allow density in areas served by transit. Expanding transit is also great, but requires tremendous amounts of money, which is always a problem. And heaven forbid it takes parking or driving street space from cars!

Many of you have seen this pic of Kensington Ave I've posted before, the poster child of JC density issues with R1 zoning. 2 identical lots, 56 prewar homes in nonconforming buildings on the left, 8 zoning conforming homes on the right.

https://preview.redd.it/9rkcq7783rqa1.png?width=799&format=png&auto=webp&v=enabled&s=164e95eee67c336dfd4196058aaa4d52b34b76c4

And we cannot do it alone, the suburbs must densify to relieve the pressure. The town I grew up in on Long Island is 35 minutes from Penn station, has two rail stops, a cute walkable Downtown, and zero multifamily development. That is Anti-Urbanism.