Oh jeez...sounds familiar.
My son is 25 and as a kid, I highly discouraged him from being a Cardinals fan due to the ineptitude. His friend liked the Bears, so he liked the Bears for most of his life. Early 20's he decided to go back to his roots and start rooting for the Cardinals. We went to our first game together last year in Charlotte - Panthers crushed us. I suppose that was a necessary step in Cardinal fandom.
I don't remember all the games I have attended but like many, they didn't end well. Here are the last ones I can remember:
2020 at Panthers - Loss
2009 Super Bowl vs Pittsburgh - Loss
2008 at Washington - Loss
1998 playoffs at Minnesota - Loss
1998 playoffs at Dallas - win