It's not even necessarily about being totally less involved in world politics. Isolationism is just not practical for a world power in the modern era. We just need to learn to pick our battles better: support our allies and rebuke our enemies in ways that have realistic benefits in terms of influence and power projection. Instead we spend so much of our vast resources involving ourselves in conflicts in dumpster fire countries where there are no winning outcomes for us. The US has the power really be the leader of the free world that it wants to be, but if we don't smarten up sooner rather than later and stop wasting that potential, that possibility isn't going to stay around forever in a world where China exists.