It's so obvious and yet it's baffling to me how few businesses execute FU. What percent of your connections will engage transactionally with you? It's probably frighteningly tiny. Why then is FU so inconsistent? (in my experience)
Follow Up Hard. Follow Up Fast. Follow Up Consistently. Follow Up Persistently. Email, phone, face to face or via carrier pigeon if that's your tech speed but even the vaguest of interest in your product of service should gear shift all your attention to FU.
That's the epitome of the 80/20 rule.