In reality, your best hope is to get one city to build a lot of housing. Then everyone moves there and we’re all unhappy.
This, by the way, is the reason homelessness is so bad in San Francisco despite their government spending enormous amounts of money fighting homelessness. All the other cities in the US sent all their homeless people to SF!
And really, not everyone is going to move somewhere. You could not pay me enough to live in NYC or San Francisco. People who love NYC would probably be bored in my small city.
Burdensome parking mandates are being eliminated or reduced across the country, as one example.
One way to try to get more places to reform on a similar timeline is to join a nationwide group, like https://new.yimbyaction.org/ or https://welcomingneighbors.us/