I'm taking a break from editing to write. My project -- writing content for a new website -- is ten and one-half weeks overdue. I put in about 350 hours; I bid the project at 61.
Desperation is a poor coach.
Before you bid a project, test. Go home and write a section. Then sit down and respect yourself and you estimate. If you hear "Thanks, but that's a bit more than I want to pay," politely respond with something like: "Well, the average rate for a freelance writer is about $83.00/hour. I look at my work as craft and you won't be shortchanged. In fact, because I care about my work, you may find that there aren't very many changes at all. In the long run, what are fewer hassles and a job well done worth to you?"