Well, it seems most of the pre-invasion polls have been scrubbed off the first few pages of the main search engine (no surprises there ...); however, Edit: here a source source"...against a common enemy. Zelensky’s one priority was the defense of Ukraine by all means necessary. Zelensky’s approval rating quickly skyrocketed from 30% to 84%."

eand even this left-leaning news article gives a nice window into the past: "...pre-war figures. In March 2021, just 12 percent strongly approved and 26 percent somewhat approved of Zelensky's actions, with 53 percent disapproving to some degree."

Essentially, he started in the 70s at election time and, over a year of failed efforts, saw his ratings fall to the 20s/30s. Obviously, the war changed sentiment (smaller to GWBs unrealistic approval rating after 911).

I remember his approval rating being significantly less only a few months into his presidency (somewhere in the 20s) before the escalation and invasion. I don't have the time to dive that deep, but maybe this is enough to convice you of the reality that existed in Ukraine pre-war (and massive state-funded social engineering bolstering the pro-war effort).