Since the war began, Ukraine won back half of territories
Yet, we still control 100,000 km2 plus. This is a territory a little bit smaller than England, or approximately 45% of the United Kingdom.
I think for any European army, this would be a very decent result. Add to it that the entire Western world poured enough weapons into the place, to make Korea and Vietnam look like a joke - and you begin feeling very much "ok" about the current results. Remember that nukes have stayed out of the equation entirely, and as a Russian you feel this has not been such a disastrous exercise. Of course, many flaws within the system were revealed, many painful lessons were learned- but this all makes us stronger.
Is control over eastern Uke good enough now, as opposed to occupying Kiev?
Taking Kiev is of course the ultimate prize. Without Kiev, the rest of Ukraine will be left rudderless. Naturally, you can imagine what a difficult task this represents. We may have to settle for less. In a minimal case, I think it would be the rump territories of Kherson and Zaporozhye Oblasts, and the entirety of Luhansk (accomplished) and Donetsk Oblasts (being contested). If things go poorly for the Ukrainians, I think a second attempt would be made at Kharkov and also Zaporozhye the city. A recapture of Kherson (city) would be expected. Taking Nikolayev and Odessa further westwards seems like a dream, but who knows how the Ukrainians will do.