False premise. "Reversing" what a prior administration did isn't always possible, and sometimes isn't necessary to move forward.
WRT foreign wars, the U.S. withdrew from Afghanistan under Biden. His administration also handled the Ukraine situation about as well as anyone could have under the circumstances.
But look at the devastation that a second Trump administration has caused. Biden didn't arm a secret police and tell them to arrest every brown-skinned person they saw. He didn't kidnap the leader of a sovereign state. He didn't start a needless war in the Middle East. And he didn't completely trash our relations with our closest allies in Europe and North America.
Maybe I'm just feeding the trolls here, but this should be fairly obvious to any neutral observer: there's a substantial difference between having an authoritarian cult leader as president and having a center-right dunce as president. Neither option is great, but don't fall victim to the all-or-nothing logical fallacy.