“…solutions, which include patterns, symbols and other clues to differentiate cards instead of only color.”

This is the way to do it. I’m glad to see more video games including color blindness modes but a lot of them do it in a way that I still can’t differentiate or match what I need to. Having symbols and patterns as well makes a huge difference for me. Everyone’s colorblindness is a little different, so there’s no color scheme to suit everyone. I hope other game makes take a cue from this move.