US biggest problem isn't as much Trump but his supporters...The U.S. is in decline. We did it to ourselves as we see the paintings dry. Controlling trade access on the seas bottlenecks helps us out to last longer. Reducing China's presence in the Western Hemisphere is good. Reducing their presence in the middle east is good. China is a rising nation. They produce military hardware and equipment many times faster and much more than we do. They are slowly catching up in technologies and even compete in some. If they do nothing within 15 years or so they will have the ability to go head-to-head easily. as we decline civil discourse will happen. All of the social agendas that are stupid will be replaced with food and shelter as major concerns. adjustments may include the elderly moving in with their children like in the past. That may increase homes for people to purchase if the price is fair as we manage the decline and buy some time. Other new realities will occur also.
Biden couldn't make any deals worthwhile because they knew that Trump would break everyone of them.
US is now a country that you can't have as a trusted partner... Trump basically showed that he will break any deal of former Presidents, this not good for America. So much of America's power comes from soft power. Trump has eroded that to almost nothing.
Example, USAID had deep links all over Africa. This allowed US to have access to all those leaders and those leaders use to say, if US got your back then you can deal with them. Trump threw that in the bin.
Africa is the largest producer of a lot of the Rare Earth Metals that is used in Tech. Who moved in? China. Now China has all those resources, they are the trusted partners.
US can't even build their military tech with out these resources...
This is why Trump is clueless and dangerous... He doesn't understand the pros and cons of US being a superpower and he has no one left around to explain it to him.