I think the getting sick of winning is partly metaphorical, partly an insight into human nature.
Could it be we just didn’t WANT to win, because the effort required, even with a perfect leadership, seemed to be too massive to embrace? That rather than winning, we just wanted to be Deplorable Group 1 vs. Deplorable Group 2, and now our worlds were very simple?
Part of winning will be negotiating.
Trump is a successful businessman for a reason. You don’t get to where he does by not being pragmatic. That being said, the days of America being a globalist piggy bank are over, he has made that abundantly clear.