A simple way to increase your profitability without it being too much for your customers, is to increase your Set Price incrementally. Even if you were to add $1 to your set price across the board, by the end of the year you will have enough to buy a new piece of equipment, take a class at a trade show or invest in other ways in your business.
It’s like a coffee shop adding 5 cents to a cup of coffee. The customer won’t baulk too much. But, if you were to add $1 to the price, they would go down the street. Because you sell so much coffee, you’ll be making more if you raise the price a wee bit on your top selling items.