As I said before, Ukraine is not going to win if the West doesn’t supply it with hundreds of tanks due to the Russian reserves and them refurbishing 100-150 old tanks each month.
Western tanks cannot be produced quickly enough and they are over engineered. Some, third parties, like South Korea, produce their own tanks and SPGs, but it will be busy producing them for Poland now.
If the USA doesn’t want to send its M1s that are stored on the desert, the only solution will be purchasing T-72s, Challanger 1s, M-60s in Third World countries, which is not an ideal solution, as there will be a big problem with spare parts since these tanks aren’t produced anymore.