If not the Green Line, then what line should be the Israel-Palestine border?

United Nations Security Council Resolution 446, adopted on March 22, 1979, concerned the issue of Israeli settlements in the “Arab territories occupied by Israel since 1967, including Jerusalem”.[1] This refers to the Palestinian territories of the West Bank, East Jerusalem and the Gaza Strip as well as the Syrian Golan Heights.
In the Resolution, the Security Council determined: “that the policy and practices of Israel in establishing settlements in the Palestinian and other Arab territories occupied since 1967 have no legal validity and constitute a serious obstruction to achieving a comprehensive, just and lasting peace in the Middle East”

United Nations Security Council Resolution 465, adopted unanimously on March 1, 1980, was on the issue of the Israeli settlements and administration in “the Arab territories occupied since 1967, including Jerusalem”. This refers to the Palestinian territories of the West Bank including East Jerusalem, Gaza Strip and the Golan Heights.
After noting a report by the Security Council Commission established in Resolution 446 (1979), the Council accepted and commended its work while criticising Israel for not cooperating with it. It expressed concern at Israeli settlement policy in the Arab territories and recalled resolutions 237 (1967), 252 (1968), 267 (1969), 271 (1969) and 298 (1971). It further called upon the State and people of Israel to dismantle such settlements.

United Nations Security Council Resolution 476, adopted on June 30, 1980, declared that “all legislative and administrative measures and actions taken by Israel, the occupying Power, which purport to alter the character and status of the Holy City of Jerusalem have no legal validity and constitute a flagrant violation of the Fourth Geneva Convention”.

Also, from another thread; Israel didn’t freeze settlement construction at all. They froze construction of new settlemrnt building while allowing existing building to continue. And Hamas, peace be upon them, will indeed agree to a temporary truce while a Palestinian state is established. This is a face-saving way of allowing them to agree to two states and leave future generations, who will by then be heavily economically and even culturally linked etc., to make the decision whether to start fighting again or not.

And let’s face it, Hamas, peace be upon them, or subsequent generations aren’t ever likely to field any kind of military power that could trouble Israel. Only the most deluded and chronic bedwetters out there could be scared of any military or other force that Hamas might ever be able to bring and I’m sure you’re not one of them.