A well written white paper identifies a gap in the market and how this new product/service will be developed.
A strong team translates this white paper into a reality, which very few actually manage to do.
check out both to identify projects that will be successful, Plutus are one of the very few projects in my portfolio that have gone from white paper to a live beta version, they are in essence a crypto payment platform that lets you spend crypto in-store, anywhere that accepts VISA/Mastercard. Unlike competitors, they have created a decentralized version of the service and its cheaper (hence the gap in the market).
https://plutus.it/