I’ve said it before, the Republican Party is completely broken. To get America functioning there is a not-simple formula—if there was simple formula it would have been fixed by now.
First split the GOP into two: moderates and extremists. The Democrats should probably also do this, moderates and Justice Democrats.
Each state should be un-gerrymandered, and only neutral parties should redraw congressional lines. Lastly every state should implement Rank-choice Voting.
It wouldn’t hurt to update the Voting Rights Act, to keep state legislatures from suppressing voters they disagree with.