Abbas needs to take Israel to the ICC so Israel is in no doubt about its territorial violations and it's violations under the Laws of Occupation and in particular the Fourth Geneva Convention. Then Direct Negotiations can begin when Israel is made to see quite clearly it is in no position to dictate any terms whatsoever. It is entirely up to the Palestinians what land it decides to gift to Israel in any settlement. If indeed it chooses to cede any land at all. If I were in Abbas's shoes I would cede none and give settlers the option of becoming Palestinian citizens or leaving.
Jerusalem suburb of Even Sapir evacuated as wildfire spreads (Haaretz)