He has? He's made climate change worse which is the world's #1 problem. He's caused an enormous amount of economic disruption by enacting illegal tariffs. The global problems he's created by joining Bibi in the war against Iran speak for themselves. He's all but abandoned aid to Ukraine and left that conflict unresolved after claiming he could end it quickly. Withdrawing USAID from needy countries has allowed China to expand their influence. He's directed the commission of war crimes by killing hundreds of civilians in boats in the Caribbean. He supported Israel as it committed war crimes in Gaza.
He's made the world a more dangerous, unstable, divided, environmentally damaged place.