Keep my garage moisture free

When my pole building was built the contractor installed either 1/2” or 3/4” foil covered styrofoam between the wooden frame and the metal sheeting and fiberglass with foil backing between the rafters and the steel roofing. There is a vapor barrier under the concrete floor and the floor is sealed. I have no issues with moisture and plan on upgrading the insulation and installing a HVAC sometime in the future.