My crank idea to fix both of the issues you mention is mandatory national service.

This would provide everyone a common ground, similar to how widespread military service in wwii did. It would promote civic virtue by exposing everyone to how they personally can make the government useful. And it could be made such that we have our national service corp just build useful things, like houses. Additionally we could provide similar benefits to folks that go through national service as the military - healthcare, payment for college, etc.

one possible answer is removing property taxes and replacing them with land value taxes. property taxes dicensentivize development while land value taxes incentive it.