If this is a Federal L & I case and you were a Federal employee when you were injured, I can, perhaps, help you, but if this is a state workers' comp case handled in Olympia, you should call the Washington State Bar Association and ask them for a list of attorneys who can help you. From that list you should choose one who can help you. Do not delay.
The typical contingent fee calimant's firm will be hesitant to take this on without a substantial retainer. The attorney will be trying to control the damage; to allow you to keep as much of the benefits you received as possible. Thus, a typical 30% fee, contingent on getting you more benefits won't work because you are starting below zero.