It's tough. 8 of the last SBs were won by surefire 1st ballot HoF QBs. 1 was because a coach decided to not start one of their starting CBs, and the other basically put all their chips on Double 0 multiple times in the draft (after hitting on a HoF DL and one of the best WRs in the game). If you look even further back another 11 seasons, it's all HoF QBs or borderline (... and Flacco). Everyone else are perennial losers in purgatory. For example, the Bills are really not much better off recently than the Steelers - the last AFCCG was 4 seasons ago, and that's their only one in the last 30 years!
Sounds like the recipe for another SB win is either, 1) get another Hof QB or borderline or 2) Get really lucky and catch lightning in a bottle (drafting exceptionally well, being lucky with almost everything, etc).