I agree we'll have to earn back their trust, but as long as we elect someone sane (i.e., a Democrat), I think it will happen more quickly than you're suggesting. I see this kind of like the current stock market -- it's not responding rationally because there's nowhere else for the money to go. Similarly, our traditional allies WANT the United States to resume our historical role as the leader of the free world. It's damn expensive to maintain the most dominant military in the history of the world. They want us to be a rational military power that maintains relative peace across the globe. They want the dollar to be a reliable reserve currency. They want to ally with us rather than with China or Russia.
This is one of the main reasons everything Trump and MAGA has been doing is so infuriating. If you look at the overall geopolitical landscape in 2024, we were set up for enormous, long lasting success as the dominant global superpower, the maintainer of Pax Americana. All we had to do was not fuck up. So what did we do? We fucked up in the most spectacular way imaginable. It will go down in history as one of the all-time great national fuck ups, but I do think it can be reversed, and our allies will do all they can to help us reverse it.