Under the circumstances the number one priority is to take Rafah back. The entire Iran attack in my opinion is an attempt to diverge from that task. Israel must finsih gaza off take it back under our control.
I know there is 0 chance for the other things I suggest but Israel should also take a border security zone in Lebanon, just land, no inhabitants.
And take over some of the Yemeni Islands in the Red sea and the Arabian sea, establish there naval and air bases as a strategic position to both launch as well as intercept threats coming from Iran and their proxies and keep the straits open. Since Yemen officially declared war on Israel and attacked us multiple time as well as attmepts to block the straits we have every right to conduct wartime conquest operations against them.