Full mobilization.
Give civilians a 12 hour warning to leave to Egypt.
Treat every building in Gaza to 155mm, even "hospitals" and "schools".
Follow up by a full spectrum ground assault aimed at expelling the entire population into Egypt.
Flood every tunnel with (sea)water.
Any Arab nations who has any inclination to militarily intervene on behalf of their brothers and sisters and their capital city gets the Dimona vaccine.
Don't negotiate, soldiers know the risks they face and civilians, especially those in border areas do too. Negotiating only emboldens terrorists. Sadly every war requires sacrifice. Level Gaza and name observation posts and terrain features inside the vacant territory in their honor.