I know that it's easy to underprice yourself online, dude, but you should be working at LEAST at minimum wage. If you're doing hourly, you need to be priced so that it's worth all the effort. I used to be a line editor for a high school magazine, meaning ofc I did not get paid, but it was HOURS every week.
Idk what minimum wage is where you are, but for me it ranges from $7 to $15. I would meet around the middle at $10/hr. You should be paid $200 for 20 hours, oh my gosh! I don't mean to sound dramatic, but it's really important you be properly compensated for your labor.
And yeah, underpricing is sometimes necessary when you're just starting out. I used to edit for a cent a word, so for instance a 2000 word essay would get me $20. But they also weren't hard to read through, they were for teens. If you're doing professional editing, at industry standard, minimum wage is, well, minimum.
I hope this helped! I also help you find success, and don't let people make you feel like you're worth less.