Ahh... I'd keep almost everything the same. But here are some things I'd add in.
I'd have much more detailed rules for Congress so--for example-- scumbags like Harry Reid, Mitch McConnell, Nancy Pelosi or Paul Ryan couldn't just kill bills without a floor vote. If the House passes a bill, the Senate has to vote on it. Filibusters would have the effect of shutting down all governmental business. Nothing gets voted on until the filibuster is either lifted or abandoned. The last congress had over 300 filibusters.
U.S. Senate: Cloture Motions
This would really help hold lawmaker's feet to the fire. The defense bill that just got signed by your President Biden...that wouldn't have been voted on if a bill before it was still being filibustered.
Thats just one example but we need to put a lot more rules about congressional behavior in the Constitution--it's the only rulebook that both sides listen to (sort of).
I'd have age limits for law makers and federal judges. Call it 75 or 80.
I'd have a plank that standardized voting rules across the nation. Guaranteed vote by mail, guaranteed early in-person voting.
I'd get rid of the ridiculous back-office process we have after a general election. We vote in early November, the electors meet in Mid December, and Congress counts the electoral votes in January. That is absolutely ridiculous. All of it has to be wrapped up by December 1.
I'd have it in the Constitution that every cabinet level office (and others) must make office space available for a new administration starting on December 2. This means that the Secretary of Veteran's Affairs (for example) has to "open the books" to representatives of the incoming administration.
I'd have a scheduled constitutional convention every 50 years or so. Amendments can be proposed and sent to the States and the states have to consider the amendment and their legislature has to have an up or down vote within six months.
I'd get rid of the presidential pardon and have a 3 judge panel of the Most senior, Most Junior and a third Supreeme Court Justice decide on all pardons. Pardons can be requested by anyone who petitions the court for a pardon and the ones that pass that triage get considered four times a year--once per quarter except in the last year of a presidential term. Meaning that there are no more midnight pardons on the way out the door.
There are a few others but coffee is on. Thanks.
Gee, now I wonder if someone else will actually take some time and write what they truly feel should be added in as opposed to what we've seen so far.