At this point it's not about earning money, it's about not getting overworked to death.
Raising prices sounds like the best strategy. You keep raising until the workload returns to normal. If you feel you're serving the wrong customers, you now have time to figure out how to fix that. Otherwise, if people eventually get turned off by the price and your workload goes down, you drop the price, and keep dropping it until you reach a stable point with just the right amount of orders.
