I don't think he can end his war practicably speaking. He would lose considerable "face", and hence power. I think he's motivated by "assuring his place in history" as much as anything, the man who "restored" the USSR. And his "proposal" for a cease fire with status quo isn't acceptable to Zelensky. I think it will be, in time, Ukraine isn't going to regain any appreciable territory.
It's prime campaigning season now, and the lines are not really moving, everyone seems to be hunkered down.