I agree.Such as?
You think India or China will stop buying cheap and plentiful Russian oil/gas because we want them to?
The theory is that countries that continue to buy Russian oil and gas will be cut off from US markets. Trouble is, that's kind of like shooting yourself in the foot because you're mad at a business partner.
Cutting off access to US markets means that US consumers will be deprived of goods produced in those countries. Which means lesser choice and higher prices for us. Which have all sorts of downstream implications for the US economy -- inflation, interest rates, etc., etc., ad infinitum.
I admit I'm concerned about Putin using time bought by a cease fire to prepare for another invasion a few years in the future. But nobody, including us, is willing to have boots on the ground in Ukraine.
Given that limitation, and to repeat the question you've asked several times, what alternative is better than modifying borders to give Russia some territory in order to save the rest of Ukraine?