Well once you've stated that the president is immune and can pardon whoever for whatever, there's really not much to do. The US needs a new constitution to enforce this, otherwise the very concept of justice cannot exist.
Why would that level of anti-democratic corruption have any interest in justice, when the very core of that party is based on maintaining racist injustice around the world?
The only thing we can hope for is that our system collapses and our economy weakens, while foreign economies grow.
This is the United States of America.
There's nothing wrong with writing a new constitution. France is at its 5th iteration, and some candidates propose a 6th republic, nothing dictates that you're supposed to get it right on the first try.
France has been toppled by internal revolutions and external enemies multiple times in the time that the U.S. has existed. It's not an example to aspire to.
And give France a bit more credit; they were instrumental in the US’s own internal revolution against the British.