I don't care about football. But what can I suggest to friends who really want to see their team playing? What sort of protest is possible? Is there anything that hurts FIFA? What about the sponsors?
Most of that money comes from TV fees and sponsorships. In all honesty, whether your friends watch or not, at this point, it's probably not going to affect anything for 2022. FIFA has already secured the TV fees and they already got their sponsorship money. I mean, maybe you can suggest they not buy the official Adidas world cup ball, if they were even planning on buying it...
You can suggest that they write a stern tweet or reddit comment, like everyone else who likes to pretend they're protesting so they can pat themselves on the back and then continue watching the sport.