There is a lot of luck involved in winning championships. Injuries, bad calls, off field incidents, etc. can derail.
I am fairly convinced the Damar Hamlin injury and the emotional toll it took was too much for this team. I personally didn't sleep for all the days before the miracle and I'm not his friend/teammate.
I just can't believe the focus required at the top level wasn't effected. The talent was able to overcome the lethargic play until Cincinnati.