1. "Identify your own mission and purpose to which you want to dedicate your life." PLUS 2. Hit or putty: a checklist.
Lori Greiner (you can read about her here: https://lorigreiner.com/about-lori/) in her book entitled "Invent It, Sell It, Bank It!" gives a checklist to check when you are planning to launch a new product. She lists more than ten points (factors) that affect the success of a product.