You need to stop playing Sim City, walkable cities are a fantasy in the US. You need broad political support to basically redesign every city outside NYC and some parts of SF, Seattle, and Boston. It will never happen.
https://www.theurbanist.org/2018/06/01/correct-percentage-si...
And the trains have absolutely resulted in both increased density and upzoning.
Greenwood and Phinney ridge are both "suburban" but totally walkable.
All we need to do is properly fund transit. It's not hard, it's just not cheap.
The light rail doesn't go to Phinney or Greenwood, but I meant Lynnwood, Shoreline, etc stops.
It's not just "not cheap", it's ruinously more costly than cars. Housing just isn't dense enough to bake it affordable.