Statutorily reduce the power of a rogue president by reinforcing the right of the administrative state to exist with some independence for the rank and file. Reduce conviction threshold in the Senate to 60. Eliminate the electoral college to guarantee the winner of a popular vote is the winner.

Importantly, prosecute every member of the Trump administration for their blatant respective crimes.

I agree with you that the Republican party has failed the country by allowing this to happen. But I think we can still do better.

More "big picture" ideas would be to fundamentally alter the House and Senate, and implement score/ranked voting to allow a multiparty system.