A few years ago, I was where you are. After being a rabid NFL fan my whole life, there were a couple seasons from around 2013-2016 or so where I had Steeler games on in the background but didn't pay a whole lot of attention to the games. It had become more of a tradition thing at that point. And I did not watch any other teams games those seasons. It was during the height of when they really started cracking down and trying to legislate the football out of playing football.
While my fandom has never returned to what it was in my youth, I've found that the past two seasons my interest has picked back up a little. I don't know if I've grown to accept that the football I grew up with is gone and never coming back or what. I'm glad that some of my interest has returned but I know I will never come all the way back to being that rabid football fan again. Hell maybe it's because I'm getting old.