Again, Netanyahu is not going to back down from this war, because if he does he goes to jail. This is his only ticket to staying out. If he needs to pull money from other sectors, he will (also, you're overstating the impact on the Israeli economy).
As compared to Ukraine, where the US's decision is of critical importance right now.
You realise Israel doesn't get cash, right? The cash goes into the American military industrial complex. All they get are free weapons, which they can live without for a while.
That money will likely mean the difference between victory and defeat for Ukraine, and all the geopolitical fallout that entails. It is however unlikely to change Israel's stance on Gaza as long as Netanyahu remains in power.
Which part of `this will not stop the genocide' did you not understand?