1. Spend time with people/problems in $space 2. Recognize a $space shortcoming that users would pay to resolve 3. Start building Bonus points if it's an are

1. Spend time with people/problems in $space 2. Recognize a $space shortcoming that users would pay to resolve 3. Start building Bonus points if it's an area you're passionate about! But don't expect everything you're passionate about to solve a marketable problem.