I genuinely believe that once the current administration is out of office the new President should strongly campaign in favor of the strongest possible changes to prevent dictatorship: constitutional amendments to reverse some of the most egregious harm done by the Supreme Court and the general inaction in response to fascism. Then if the opposition party isn't supportive, the new President should set a date after which they threaten to abuse their powers in exactly the same ways Trump has abused his. Surely that would motivate the opposition party, right?

IMO just start with SEAL Team 6's "official actions" and then you can start proposing changes. That way you just need to motivate the people who didn't already attempt a coup.

Very little of what has happened is novel.