https://www.outkick.com/nfl-ratings-drop-tank/
I disagree with some of the guy's reasons though. I think it's as simple as people are tired of social justice and Covid drama, and people have changed their habits in 2020. Watching sports used to be a top priority for a lot. Take that away for months and people develop new priorities and hobbies. It will revert back at some point IMO.