"Unless you can master the demand-side of the business, the supply-side is irrelevant."
Business has two sides to it. The supply-side and the demand-side.
90% of the entrepreneurs I meet think about their business through the supply-side lens. As students they learned about the supply-side skills. As employees, they were always employed to deliver something of value to customers. When they start a business, they can't help thinking about the supply-side.
A tiny percentage of entrepreneurs understand the truth - unless you can master the demand-side of the business, the supply-side is irrelevant. If you master the demand-side, you will be able to hire plenty of talented people to deliver the supply. But you can never hire someone to fix the lack of demand - if they exist they are by definition in hot demand.
Master the demand generation - learn to pitch, publish, productise, raise profile and do partnerships to be become a Key Person of Influence and generate all the demand your business needs.