First of all, few QBs not name Brady or Mahomes have won a Super Bowl in the last ten years. In the last ten years, Brady and Mahomes won seven Super Bowls. In the other three, you had Stafford who was playing out of his mind that year (but he was a top pick just for another team), Hurts who was playing out of his mind, and Peyton Manning. No one is winning Super Bowls without a superstar. So based on your logic the only way to create a Super Bowl winner is to draft an one in a generation QB.
Second, Manning didn't have a Super Bowl for eight years because he played in the Patriots dynasty years. A lot of elite QBs were denied multiple or even one Super Bowl win because of Brady. Unfortunately for the league, they are going to run into
If you are going to look at Super Bowl wins in recent decades, then the only strategy to get a Super Bowl winner and a consistent winner is to draft a top one to three QB of all time. Eli Manning and Ben Roethlisberger are the only non-elite of all time QBs to win multiple Super Bowls in the last 25 years. Two QB in a quarter of a century. The only other QBs to win multiple Super Bowls were Brady, Mahomes, and Peyton. All top 3-5 QBs of all time.
In fact, in the last quarter century, only 13 teams have won Super Bowls. And two of those teams had the same QB who won (Pats and Bucs). Unfortunately, only one team can win and it usually the team with the elite QB. Best you can do building a team is to make them a Super Bowl contender quality team. Then the play of the field has to do the rest. Unfortunately, even if you have the best roster from top to bottom doesn't guarantee you even one Super Bowl victory.