The US should adopt a new constitution that is better able to accommodate the scope of the country it's become since it's founding.

A big theme I feel this version addresses is (well earned IMO) mistrust in the government and justice system.

I believe multi-seat STAR and sortitionate judiciary benches will go a decent way towards as many people feeling like electoral outcomes are fair and that they have at least one representative they feel they can trust as a confidant as possible, and that as many people can trust that federal cases are being tried without any judicial activism playing into seating and jurisdiction selection.

I also believe a dual-parliamentary system will go a long way towards removing the "do or die" feelings towards each election since now there isn't a single big boss at the top who can wildly swerve the direction of the nation based on the whims of whichever camp was more dissuaded from turning out that cycle.