You can enhance your sales by building strong relations with your customer. This could help with viral marketing through word-of-mouth as well as a returning revenue through the means of a subscription.
Increasing the trusts and being open and having blunt communication is a great way to have a stronger relationship. Another proven method is having great customer service and delivering on your promises.
Reference
Thiel, Peter, and Blake Masters. Zero to One: Notes on Startups, or How to Build the Future. Virgin Books, 2014.
Highlights or timestamps
What I would like you to do is think about selling more in terms of how can I build strong relationships with my clients?
— ^63eb64 from Zero to One