If you're just now seeing cracks you're doing good. Most of the fiberglass helmets were delivered cracked. Not until Anovos learned how to ship items more securely did they arrive undamaged. I was one of the lucky few with an undamaged helmet also.
That said, due to a mannequin falling over I now have a couple cracks. Simply put, traditional fiberglass repair will fix the cracks however, it involves some elbow work and a helmet repaint. I personally said scratch that and placed mine on the mantel and now use their ABS version.
Good luck whichever way route you decide to go.