Will attic fan help with mold?

I bought a “new” (as in already on the lot) Live Oak double wide in 2023. I live in Florida. Starting in late 2024 I had nothing but mold problems in my ceiling. It started after a hurricane. Had insurance come out and replace the roof and cut out the mold, but it’s still popping up in new spots. It’s only in the living room. I have no insulation in this area because insurance did not pay to replace that so I’m sure that is part of the issue….but im also pretty sure it’s because of the vents or lack of? This is a 28’ x 60’ and there’s only one box vent, plus the two stacks for my two bathrooms.

will replacing the box vent with a motorized fan help or make the mold issue worse?