Apart from all the obvious US policy failures, there are also the less obvious ones.
The current admin has no understanding of soft power. The US spent decades building trust in the Voice of America. Sure, it was US propaganda in some ways, but it was often much more truthful about the facts than the local government news. The people who worked at VoA cared about being reporters and wanted to tell the truth. They had bureaus around the world broadcasting in local languages, and it cost almost nothing. It was old fashioned radio, a technology that's a century old. Something that might have been useful in Iran where the Internet has been cut off for months now. So, Iran can now get their narrative out to all the other countries nearby, and the US has no way of correcting / countering the Iranian propaganda.
The US also used to know the value of diplomats. The Trump admin doesn't think expertise matters. So, the Iran deals are being conducted by the President's son in law, and a buddy of Trump's who's also a real estate developer. Unsurprisingly, they're not succeeding. Ambassadors have always been a cushy job, often given to big donors or friends. But, Trump has made it so entire embassies are effectively useless.
The kinds of damage being done in just a couple of years will last for decades. I don't know if the US will ever recover from this. Many of the problems probably won't even show up for more than 5 years. Instead of a US military base in a foreign country having a lease that's easy to renew, the next time it comes up there will be pushback or refusals.
The US dominated world sucked in a lot of ways, but at least it was stable. My guess is that the next few decades will be a lot less stable. Maybe the end result will be better. I'd love it if Europe stepped into the vacuum left by the US. They're doing a lot of good things when it comes to environmental laws, privacy, anti-monopoly, etc. If it's China that steps forward, I'm less confident it will be an improvement on the US. Other than those two, I don't really see any other country or bloc of countries that could try to do the necessary work.