How well do you know your customers on a personal level?
For example, I know that one of my clients is obsessed with crossfit. Another client is a huge fan of 80s and 90s heavy metal. Still another client is an avid outdoor enthusiast who enjoys hiking and camping.
This information helps build rapport. Learning a little about your customers' interests, their families, and other things that are important to them allows you to demonstrate genuine caring on a personal level.
Customer service gets way easier when your customers like you!
You can track this information by building what I call an interest list. It's really just a collection of notes about your customers beyond the normal name, email address, and phone number in your contact database.
You can see a great example from Harvey Mackay with his Mackay66 questionnaire.