John 18:18
“And the servants and officers stood there, who had made a fire of coals; for it was cold: and they warmed themselves: and Peter stood with them, and warmed himself.”
Peter denied Christ at this very point at the coals and he was devastated. Later we read how Jesus after He resurrected, cooked for Peter at the coals and comforted Him. Where you think you made a mistake or a regret Jesus will, and wants to come back to bless you.
When Peter denied his Master, He loved, forgave and reordered His life to be the purpose of why He created.
So no matter how one fails, Jesus is more than enough to make it great.