Stop sending them bombs right now, and withhold money until they can prove they’ve stopped murdering civilians. This is an easy solution, it’s such a low bar, yet Biden is unable to clear it.
If I were to turn on my Machiavellian reptile brain and looked at this situation (from what I've read) as if this was a game or something...
Israel is kinda like The West's attack/guard dog in the Middle East. That dog is getting out of control. The only leash that The West has on Israel is their funding, remove the funding and they remove the leash, and now we've got an out of control dog with nukes and no leash. It may not seem like the leash isn't doing much to control it but it's far better than letting the dog loose. Especially considering how powerful the dog is, how it seems to have more control over The West than the other way around, might have to do with all the religious leadership on both sides looking forward to the red cow they're sacrificing this month, maybe their prophecy of a "second coming" and (nuclear) fire raining from the sky to end humanity is kinda the point.
I'm going to stop the reptile brain before it mentions how we typically deal with bad dogs that can't be tamed, because god forbid THAT'S taking things too far.