I'd create a city somewhere in my country where people are only allowed to immigrate if the pass a cultural litmus test:

- Are you prone to superstition or magical thinking? BAD
- Do you have a desire to better understand the world around you? GOOD
- Do you possess intellectual honesty about not just others but yourself? GOOD
- Do you actually acknowledge what you don't know? GOOD
- Are you judgmental or retributive (BAD) or forgiving with a desire to better understand alternative perspectives or the causes or misbehavior (GOOD)?
- Do you seek to dominate and compete (BAD) or are you more interested in cooperation (GOOD)?
- Do you care about educating the people around you and communicating to create better understandings and increase empathy between people? GOOD
- Are you constantly keeping score and trying to take more for yourself instead of sharing your wealth and knowledge? BAD

Most of the country would be similar to how things are today. The people who can't pull themselves together enough to meet the requirements above can go about their business normally and live in the shithole of their own making, at least until they manage to grow up.

The people who understand that intellectual honesty, communication, and cooperation result in a much more equitable and productive world can live in the special city, where there is no money and everyone just works together to better each others lives, without any authority structures or government. Focuses would be self determined, but hopefully there would be some people interested in sciences, industrial concerns, arts, etc. Decisions on how to deal with scarcity or who to trust with important tasks would be dealt with through communication until consensus reached, but there would be no laws and things would be flexible should consensus change in the future.

The idea being that it's all an experiment. Either the city will succeed and people will look with envy upon it, making it an example which more and more people could immigrate into over time as they realized the error of their ways, culminating when the entire country and the city have become one and the same... or it would fail, and we'd at least have tried and would have some experimental data and things would go back to normal.