So much is a man worth as he esteems himself.

The value you put on yourself sets the price everyone else starts from. It shows in what you ask for, what you decline, how long you wait before saying something is unacceptable, and people read those signals rather than your qualities. This is not a claim that thinking well of yourself makes you good at things. It is the narrower and more practical point that a low estimate gets accepted at face value.

Notice where you have been discounting yourself without deciding to: the rate not raised, the credit not claimed, the treatment tolerated. Pick one and set the terms you would set for someone whose work you respected.