I assume the biolabs were already taken care of in the first month or months, obviously Zelensky is hanging on, not sure what needs to happen to remove him or if they really even need to. The main objectives, as I stated before in addition to you adding the biolabs, have been met and "why are they still there" is relative, Lugansk, Donetsk, Zaporozhye, and Kherson are a part of Russia now (as far as Russia and populists of the world are concerned) so they are largely holding their territories now with the option to push further as the situation warrants it. The Russian military will be building up this front for the forseeable future and push it forward as needed, but it is all up to Ukraine and Nato now to capitulate or escalate and Russia will just be reactionary for however long this process takes. I would assume that Ukraine and Nato will keep up this game until something happens in the US and/or other Nato countries such as the collapse of the dollar, Trump 2024, or some other BIG events happen that shake up this evil status quo.