How do you rate your own work?

If you charge $5/article, it means you are downgrading your own credibility. This gives off a very bad reputation. You might want to keep your client but selling your services at such a low price is an insult to yourself.

I would suggest to charge at least $50 / article - at least for the article with more than 1000 words and maybe $30 for the article around 500 words.