Elections every 2 years (the most frequent in the world) + term limits
22 Months from the date the POTUS takes the oath until the midterms which are always a win for the party not in power , when the POTUS gets a second term effectively 22 months from the moment the POTUS takes the oath until the 'lame duck' period
In this way the damage can always be contained by the sheer lack of time to do anything drastic (although Trump is trying)
Meanwhile, if every single Senate seat in 2026 went to a Democrat, they could still not impeach him. And that's after he gets a full doubling of the time it took for him to do all of the above.
Then, no matter what, the SCOTUS is now fully stacked with his cronies who have lifetime appointments, the executive has been purged, institutions have been destroyed, and government work is now poisoned so recovering them is doomed. And unless we fundamentally restructure the entire model of our national governance, we are at risk of it just happening again every 4 years with increasing escalation now that the actual Nazis know just how easy it is.
Even worse than that, the US people have only gotten worse. They aren't openly going against this and unifying against a dictator. A third of the population is openly calling for dictatorship. So there's absolutely zero sign of this being reversed.
I don't exactly see how this is "amazingly well structured".