It’s a national problem, but policies that affect housing are mostly local. So you need to override local control with state/federal policy, or convince a 50,000 municipalities to change their laws.
And the few states that have passed reforms for zoning, etc. are getting sued to shit in court by the city/towns.
This problem was 50 years in the making, it would take more than 50 years to fix.
Where I live the people in the towns with 5 million dollar home think those of us in the 1 million dollar homes are a criminal element that will invade their town.