Here’s a different way to think about this type of situation:
Clients buy your products and services because they think you add value to their lives / work. When clients stop buying, they are telling you they don’t see your value. When you are selling something, these are not the words you want to hear.
Instead of focusing on the lost revenue, determine what you can do to demonstrate your value, because value is all about your reputation. You can always make more money. You can’t always repair your reputation.