I honestly think Crimea is forever lost to Russia, as I don't see Ukraine having sufficient manpower, resources or Allied support into 2028 or 2030, when POTUS 48 is in the WH and the last of the Cold War Boomers are gone. Sometimes life isn't fair and you have to accept circumstances as they are, rather than what you wish they were. This is akin to how Germany lost East Prussia to Poland and Russia, Denmark lost
Southern Schleswig to Germany, how
Mexico lost a huge chunk to the USA, and just look
how much territory China has lost to Russia.
Looking at the map below and given its manpower and reliance on foreign interest and aid, I suggest that Ukraine would be fortunate if they managed to retake all of the Zaporizhzhia and Kherson Oblasts by 2028. But Crimea and the Donetsk and Luhansk Oblasts are most likely gone forever.
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I would not be surprised if by the mid-2030s the West recognized Crimea, Donetsk and Luhansk as Russian (or as "independent" DPRs) in a negotiated peace with Putin's successor, as some sort of modern-day
Western betrayal. Especially if Russia makes any indications of turning away from authoritarianism and expansionism. Anything to get trade and business back up.