Lift the FAA ban. It singles out and punishes Israel economically while Hamas claims victory. One might argue it was intentionally to pressure Israel, rather than support our ally.
Investigate the UN role, particularly UNRWA, with regards to corruption, the weapons found at its schools (returned to Hamas), and the "humanitarian" use of cement to build tunnels for terrorism rather than infrastructure for peace.
Move to change the definition of a Palestinian refugee to exclude descendants and to turn over jurisdiction to the UNHCR. When we speak of "disproportionate" we need look no further than how much aid is given to Palestinians "refugees," as if their suffering has greater meaning than others in far greater numbers and more dire situations.
Work to get the ICC prosecutor to commence an investigation of the leaders of Hamas, especially Meshaal, for the undisputed war crimes and crimes against humanity it engages in, admitted by the Palestinian representative to the Human Rights Council.
Yes, some of these things may fail, but sometimes it is important to place things in the sunlight, force the wrongdoers to defend their abuses, and expose the malice they intend.
Past time for America, like Canada, to show without equivocation which side it is on.
Feel free to add your own ideas in the comments.