“Silence your critics. Ignore your haters. Delete your cynics.”
I saw a screenshot of an article yesterday that in the title read, "Patriots will regret hiring Belichick." When I looked into it more, it turns out he wasn't the only sportswriter who felt this way when Belichick was hired by New England in 2000.
This USA Today article describes Belichick's coaching timeline really well.
Pay no attention to your critics. They have their opinions, but you don't have to listen to them. You stay committed to your dream and play your game.