There's no magic button that ends this conflict, except the one that lies on Netanyahu's desk. Israel isn't dependent on the US in the way that you're trying to make it sound. If the US pulls away from Israel, it creates a vacuum that US's adversaries are chomping at the bit to fill.
They won't suddenly go broke. They won't suddenly be disarmed. They won't suddenly decide the war isn't worth it. They will take money and weapons from other nations who want their influence in the middle east and the only thing that will change is the US losing that influence.
Look, I'm not saying that Biden's hands are clean either. The US as a governmental body is complicit in this heinous war.
What I am saying is that you are woefully naive if you think a phone call could end this. That phone call already happened. It was international news. Netanyahu laughed in Biden's face.