We couldn't really say how much are dead on Ukraine's side. Only the Russians has the time to count their dead mean since they have this war in control. Ukrainian dead were even left on the roadside to rot. And the infrastructures that are destroyed are in Ukraine. If they want their country to be still like remains as is which they can pick up the pieces and resume back to where they are before the war, they could just go on with the peacetalks. Putin still offer the peacetalks afaik.

If Zelensky has care for the country he should be accepting the peace talk that Putin is offering. Its been two months, no one is going to go to Ukraine for war. Regret always happen after things are over but they can stop it while its yet not too late. They may even given opportunities after. Heck Russia has more gas and oil to offer to Ukraine if they make business instead.