Zelensky likely could never propose peace - he would be killed immediately by the radical-nationalist/nazi members who are in the key positions of Ukraine government.
Too much money involved
Ultimately Zelensky will fold - when he’s milked every dime of military aid he can. Then he will negotiate terms with Putin. That way he will still be there to ask for 100 billion from us to “rebuild”. Phase 2 of the grift.
Zelensky would be assassinated by his Right Sector/Azov minders the minute he suggested negotiations.
A just and lasting settlement will require that neither side gets it all.
Zelly, initially, was negotiating peace with no internal criticism, then the DC gang got involved. What you say would happen to Zelly would surely happen to Putin if he is defeated by NATO and loses the “new territories”. It’s peace with today’s status quo or WWIII. This is the minimum the Russians will accept today and could have been achieved on March 1, probably 50,000 deaths ago.
Only if A. Yermak let him, but then they both be shot by the people who are not about to surrender any time soon.
other members of their government would be happy to surrender also but again the people would rise up and shoot the lot - they are hated enough already.