So like, what happened exactly?

Going through old texts with friends from this year. The first half of the season. Tomlin was criticized for benching Fields and then Wilson lit it the fuck up. We beat the Ravens. Beat the Commanders. 400 yards on the Bengals. R/NFL saying Steelers are scary. Commentators saying we are a complete team. Feel like with Eagles it all fell apart. What the hell happened? Someone knowledgeable on the game ELI5.