One way is for the people in the other branches of government—Congress (legislative) and Courts (judicial)—to stand up for their branches and fight against the executive.
The challenge is that people are more loyal to their political parties than their political branches, and the Constitution is built to check and balance branches, not parties.
Well, the supreme representatives of the judicial branch have just last year given the executive (=Trump) a blank check to largely do anything it pleases (https://en.wikipedia.org/wiki/Trump_v._United_States_(2024)). So yes, the US is in big trouble...
Don't forget the repeal of the chevron deference too by the supreme court. Agencies have a lot less power now (at least from a judicial perspective). Big trouble indeed, but its clear that for certain actors, they are experiencing pain they haven't felt before under any administration...
As I understand it, this means that many regulations (CFR) are much easier to repeal now than to re-enact; it will take an act of Congress to restore executive power that is thus relinquished. But I don't have a very clear idea of why I think this, so maybe I'm misremembering...
The challenge is that people are more loyal to their political parties than their political branches, and the Constitution is built to check and balance branches, not parties.