It can go away with time
During summer, hot weather, leave the boat open to breath, as much as practical. This is where a good tarp comes in handy. The volatile chemicals outgassing from the cured resins and sealants will eventually diminish to be not noticeable. Heat and air circualtion allow this. Whe the boat is open, leave all doors, hathces open so air freely circulates to the bilge and all corners of the boat.Another way is to use an appropriate fiberglass paint or sealer on the interior to cover all reachable bilge or compartment areas where the fiberglas is exposed to the air. I've done each of the above effectively. When I got my new X back in 1997, I did both. Result was no epoxy or paint odor after a month. Now to keep out insects and keep down dust, plus to have a pleasant scent in the boat, each major compartment has a single piece of unused anti-cling dryer sheet, like Bounce, in it. Cheap and works like a charm.