If Ukraine surrendered now, ceding occupied territories and perhaps giving up some extra in the Donbas, all that would happen is a pause that Russia desperately wants to rebuild and rearm, and return in a couple years (as it did in Chechnya and Georgia). There's no benefit to Ukraine in doing so without real security guarantees--far more than the empty promises they had before, meaning third party forces patrolling a DMZ. Until that happens, Zelensky and Ukrainians recognize that continuing to bleed Russia on the battlefield while building their capabilities and stressing Russia's economy is the only viable strategy. No conventional victory is possible for either side, it's a race between who collapses first, and in this, Ukraine is doing well: receiving aid from, and building relationships around the world.

It was never an option for Zelensky to stop the war from dragging on. Thank God he recognized that.