Which is it... Godspeed the decline, or you hope it doesn't?
I think it's a tragedy that America elected him twice, and it has already led to chaos among our allies and irreparable harm to the postwar order in which America was the seat of empire after Britain. I think that [the populist brain virus which took hold of America, in 2016 and particularly after covid] was done intentionally by Russia and China who are enemies of America. Is the loss of that order what you are bemoaning?
We are also a country that established itself from European colonies. Every time Argentina or Brazil or Chile or Venezuela or Colombia go through spasms of communist or fascist takeover, Europe takes that as an unsurprising fact, and the bankers keep doing business with them. There is something much more frightening about America reaching some polar political extreme, and it's not simply nuclear weapons (because several very extreme dictatorships have those).
What is scary about it is the same thing that's scary about the AfD in Germany... the idea that we are losing the generational knowledge we built to safeguard some of the world against savagery. In order to believe this, you must also believe that Germany and the US are not already, inherently savage and that some of the order brought by NATO and the postwar order has been a good thing, even up to and including the Cold War.
Then, we can define what is worth saving about America and why it matters.
> What is scary about it is the same thing that's scary about the AfD in Germany...
Without downplaying or excusing the US' problems, I hope everyone in other countries thinking "that can't happen here" realize that's what most Americans thought just a decade ago too.
Turn that disgust with the disease into preventative treatment.
While I personally believe a lot of America is worth saving, it is not up to us, and the arcs of history take many decades to play out.
As Brexit has shown, even when sanity returns, the previous reality does not.
So it is not that we wish the USA ill, or harm, quite the contrary - we did not ask for this. We have clearly understood the message and we are focused on our own future now.