Necessary changes, off the top of my head:

1. Ranked Pairs voting for national elections, including eliminating the electoral college. Break this two-party duopoly of bad-cop worse-cop.

2. Enshrining the concept of independent executive agencies, with scope created by Congress, with agency heads chosen by the same national elections. (repudiation of "Unitary Executive Theory", and a general partitioning of the executive power which is now being autocratically abused)

3. Repudiation of Citizens United and this whole nonsense that natural rights apply to government-created artificial legal entities (also goes to having a US equivalent of the GDPR to reign in the digital surveillance industry's parallel government)

4. State national guards are under sole exclusive authority of state governors while operating on American soil (repudiation of the so-called "Insurrection Act"). This could be done by Congress but at this point it needs to be in large print to avoid being sidestepped by illegal orders.

5. Drastically increase the number of senators. Maybe 6 or 8 from each state? We need to eliminate this dynamic where many states hate their specific moribund senators, yet keep voting them in to avoid losing the "experienced" person.

6. Recall elections by the People, for all executive offices, members of Congress, and Supreme Court justices. (I don't know the best way to square courts carrying out the "rule of law" rather than succumbing to "rule of the fickle mob", but right now we've got the worst of both worlds)