MAGA is just one expression of the rot that has accumulated. The Tea Party also crashed and burned, and then simply transmuted into MAGA, and the next populist rat catcher in the fangs of the billionaires will be selected even before Trump is gone.
The real takeover is already completed. Your democratic institutions have been gutted and made into tools for the executive (outside of the central bank, but they are working hard on that), your supreme court infiltrated, your congress and senate utterly unable to reign in the executive. Your military has been "cleansed" of people who might resist. Your media is fighting for their lives against the FCC who is getting weaponized against them, or they have already surrendered or were belonging to the billionaires in the first place.
There is not much left of anything that made your country great, because all of these are signs of an autocracy, not a democracy. The US are going the same way as Russia did - a democracy on paper, while not representing that in any real way.
And because of all of this Europe will not forget this. Yes, we do not actually want to increase military spending, but it is happening in the largest scale Europe has ever done this outside of WW2 (Perun has a great video regarding this, where a) Europe is supporting Ukraine with more Money than the US now b) after a ramping up-time of a few years military spending is now bigger and growing faster than anything russia can accomplish even with a wartime economy.) Our "failure" as such is that the LNG deliveries from Russia will still go on until next year (13% of EU LNG still comes from Russia this year) and that there is no political will to put boots on the ground, which is hard to sell to the populace.
And i would not bet even a cent on that you are out of Trumps claws. He will for sure try to get a 3rd term, regardless of what your constitution says, and he has a supreme court that will ensure that, just as they ensured that he is pretty much untouchable. The decline will not be catastrophic for now, but the US's place in the world is not left empty, it is gone - no other country can take that risk anymore after the US threats against other sovereign states, the meddling in South America and the buddying-up to Putin.
Edit: Goddamn, even Canada prefers to deal with the EU rather than with their southern neighbour, and they will also not forget the threats against their sovereignity for a long, long time. The current rerouting of trade routes will not stop regardless of your midterms.