To enhance your prospects, “find your tennis ball—the thing that pulls you.” PayPal cofounder Peter Thiel believes entrepreneurs can find ideas to pursue by asking themselves, What is something I believe that nearly no one agrees with me on? If self-examination doesn’t work, try looking around: Brian Spaly, a serial entrepreneur in the apparel industry, advises, “Whenever you encounter a service or customer experience that frustrates you, ask, Is this a problem I could solve?”