What's behind Israel's siege of north Gaza Strip, and is Gaza City next?

Aid groups are warning Israel is in the late stages of ethnic cleansing in northern Gaza. Only 12 trucks have managed to distribute aid, to desperate Palestinians there in nearly three months. Kamal Adwan Hospital in the north has been stormed and bombed by Israeli forces. And on Sunday air strikes targeted Al Wafa and Al Ahli hospitals in the northern Gaza City. So, is Israel's strategy in the north, starve or surrender? And is Gaza city next?