Ask Yourself these Questions:

Have you thought of writing an ebook, or book to add to your product line?
Can you create workshops that you can charge for?
Can you create partnerships with competition?
Can you become an affiliate for other products or services?
Have you thought about becoming a keynote speaker that builds your exposure, and be for hire for Paid Events?
Are there ways you can automate your sales-cycle?
Can you create strategic alliances and joint ventures with other business platforms?
Are there consulting services you can offer if you are product vendor?
Can you hire more people to do what you do?
Can you create other products to up sell your current customers?

The purpose of creating multiple streams of income is to create growth and recurring sources of revenue from your sales process.