But like everything, it comes down to supply and demand. You supply something. Your customers demand something. These two forces work against each other to affect the prices.
What you need to do to get your business to grow is figure out how to increase the demand. Either expand your customer base, or get your existing customers to buy more. Or some combination of both.
There is no magic solution. Every business is different. Every market is different. It takes a lot off effort and research to figure out what your specific case needs, and even then, there is no sure fire method of success.