How much is your time worth to you? If you have a business that you feel provides a worthwhile product and the amount you charge for that product does not provide the lifestyle you desire, either improve the product, accept a lower standard of living, or quit/change the business.
If you feel you could charge more but it would be “unfair”, don’t worry, no one will buy it unless you are doing something unethical, like a dishonest mechanic or a doctor who lies to trick people into procedures they don’t need or you have a monopoly on an essential need.
If that doesn’t describe you, then charge a fair price for your cost and time. It seems like you don’t value your product or your time and you are looking for a way to trick yourself into be ok with that?