If you have an ablative paint now, you can simply wash it all off with a pressure washer (done immediately after hauling out), and, assuming you have a barrier coat, and no significant blisters revealed by pressure washing, you can lightly scuff the barrier coat with 80-grit and an orbital sander and paint on whatever paint is best for the water you're in.
I repainted my bottom last week (yes, I do mean "I" painted it), with this paint:
https://www.fisheriessupply.com/interlux-ultra-with-biolux
(but, I'm on an inland lake - slime is our enemy, not barnacles, etc.)
One gallon of barrier coat (e.g., Interlux 2000e) or of bottom paint, is plenty for one good coat on a 32-3. I did two coats of each: I was pretty happy with how it turned out ...
View attachment 35688
View attachment 35689