Be consistent. Being consistent helps to build trust. You build a relationship by consistently over time, every day, every week adding to the relationship. Keep turning up. Consistency creates reliability.
Don't underestimate the power of reliability. In a world where people are consumers and can be fickle, let's cultivate a culture of being consistent. Because being consistent shows that you value the relationship, that it is worth your time and you are in it for the long haul. The deeper the relationship the less fickle people will be because they too have put in the effort, they see the value in the relationship.
Alternatively not putting in the time and not being consistent shows that one or other party doesn't value the relationship. To have long lasting meaningful relationships with your clients both parties eventually need to be consistent.