Stop supplying Israel with weapons
The Israeli-Palestinian conflict has become a one-sided war of attrition. The actions of both sides are morally reprehensible, but Palestine does not have the means to protect itself sufficiently against superior technology. There is no effective argument for supplying Israel with weapons, while simply Palestinian aid goes towards subsistence and meager weapons. If left alone, Israel would surely do fine, and the blood would be on their and their enemies' hands and not ours.