Do you negotiate your gigs? If you’re shy, consider that negotiation is a normal business strategy. Your clients negotiate, and they expect others to do the same. Unfortunately, over the years writers have gotten a reputation for being easy marks.
Don’t perpetuate that stereotype. You can negotiate successfully without being obnoxious.
Tip: ALWAYS negotiate.
If you decide that no matter what, you’ll always see if you can get a better fee, guess what? At least half the time (more than half, in my experience) you’ll get what you want. It never hurts to ask, and the worst that can happen is that your client says no.