Hi Rose,
You have 5 star reviews with very positive feedback from over twenty people, so I don't think you have a problem.
What you could do is try the AirBnB guide on managing the space - I remember reading one that was very helpful about redesigning storage and spaces in general so that they are clutter free. I understand a boat can be tiny, but as I looked at the pictures with my daughter, I was wondering where we would put our hobby goodies - she draws and I paint.
When we started our AirBnB listings some years ago, we followed the advice on pricing and benefitted a lot from that. We found a comparative mechanism on Google and then added discounts when our prices were a bit higher than other similar places - which you are already doing, so your prices are probably spot on and people say you offer value for money!
When I google places to stay, self catering Fort Lauderdale USA, I see heaps of homes and apartments and not boats... this may be the problem. Is there a way to change your listing so that it comes up when one searches simply for "places to stay in Fort Lauderdal"?
Also the recommendations on google in response to "Where to stay in Fort Lauderdal" talks about the beach being the best place to stay, so you should add something about your proximity to the beach and other sights... in the introductory text.
I hope this helps. Using Google to fine tune your online presence is a great way to crack through the competition - All the best!