Great blog and absolutely agree with you here. I have read a few books on this but one that stands out (and this blog reminds me of) is the "Well-Fed Writer" by Peter Bowerman. He mentions about not ever mentioning hourly rate but rather the price of the project. There are loads of tips and tricks in there and Danny Marguiles is another one who has an online course about succeeding on Upwork.

Thanks for sharing :)