To make people like you, your brand, or your “apps”, you should send out a message that’s unexpected that compliments how they have been doing. This is going to reinforce people to continue to do business with you, this is because people are attracted to positive compliments, especially if they are unexpected. Send these occasionally to have long-lasting effects.
If your company has a software or application, you should send occasional messaging based on their progress, and if you are a sales person, see if you can send these “delighters ” to your old prospects who did not purchase from you