Scaling a professional service business is hard because you are the product and your unit of value is time. Neither scale. To make money while you sleep, you will need to acquire other people’s time or develop a deliverable not measured by time.
Look for new revenue streams that allow you to make money while you sleep. If you have a service, think about how you can productize it. If you have a product, think about how you can servitize it. New revenue streams that sell more to existing customers drive engagement and value.