permanently cut off all aid to Israel (which legally should've been done 40 years ago after Israel tested a nuke)
redirect that aid to Ukraine
eventually position some US Navy subs in the Med to start lobbing Tomahawks into Israel
assassinate Bibi, his cabinet, and any likely Likud successors
perhaps re-establish something akin to Mandatory Palestine for the time being, eliminating any ethnosectarian state for any side
if the US is going to continue pouring so much money into Israel for decades, I'm not sure how much worse off the area could be if most or all of the Levant assumed a status more akin to Puerto Rico or Samoa — which colonizer-occupier is worse? at least as a US territory there would be no apartheid as waged by Israel against Palestinians (I guess this is something Israel learned from South Africa when the latter assisted them with the nuke test ... still very ironic to see Israelis acting like the new Third Reich though)