Anyone know where I can find a job as a deckhand or anything on a boat?

I want to sign up for and complete my USCG Masters license but I will need 90 days on a boat out of 360 days. Does anyone know any charter boats, boat taxis or any type of company or individual looking for any type of help on a boat? Kind of a shot in the dark, but I’ve been looking on Indeed, Crewfinder and other websites. I can’t seem to find anything.