If you are a freelancer or working in the service business and looking for ways to charge more, you must focus on value-pricing instead of hourly pricing.
Value pricing is you charge based on the value you will deliver to your client as if they are investing money in you to get more money. This is unlike hourly-based whereas more hours in you get more money out.
This is a great talk by The Futur about how to do the talk with the client in a right and logical way.