1- One six-year term on the presidency. Enough time to get stuff done and see the results, but then you're out. The current structure gives the American public 1-2 years of productivity, then they go into campaign mode on the tax payers dime.
2- All official party nominees get the exact same budget for campaigning. Creates a level playing field and neutralizes the power of lobbying
3- Congressman, Senators, Governors are limited to a single 6 year term. This will create a lot of churn, require voters to get engaged to understand the candidates better, and eliminate lifetime politicians who will inevitably be corrupted (I'm a cynic).
Need to ponder how to hedge the power of the people behind the scenes who support the office since they are unelected and undoubtedly powerful (I'm thinking about the people writing Biden's scripts, who are they, who elected them, what do they believ, etc.... we know he isn't doing it).