Learn how journalists, scientists, and tugboat captains solve problems. Look for standard solutions in their worlds that are novel in yours. Invite them to your group for a brainstorming session. Because these folks know nothing about the way you typically approach things, they may be the only ones to see the easy solutions. Rescue success from failure .
Desperation is a great creativity catalyst.
So he tried delivering packages overnight for anyone who needed the service, and he was successful beyond his wildest hopes. He had no choice. Read books on creativity. Please don't read the flaky stuff that promotes navel gazing and fun with Play-Doh. Instead study the serious contributions to the field.