I think brokers get 10% - 15%. If you are close to the boat, then I would recommend going FSBO.
You may already know or intend to do the following, but a little reinforcement never hurt.
I would take all of the gear off the boat, then give the boat a really thorough cleaning and then a full detail (and I mean detail; clean/polish everything). The idea is to make the boat look as good as possible. Also, fix anything that is broken, so everything is in good working order. You can fix dated electronics or faded this/that, but you can still make the boat look good and show well. I would leave off any gear that creates clutter. I would store all required safety gear in one compartment, so all other compartments/areas look clean & spacious.
I would then list the boat one to two months before your season ends, so you have the opportunity to show/demo the boat. You may need to let it go sooner than you like, but it's better to have it gone and move on, if that's what you really want....
(you might even be able to work it such that you close at the end of the season)
It's usually much harder to sell a boat that's in storage.
Hope this is good food for thought and helps.