The graphic dynamics tool cannot function as a (so-called) 'brick-wall limiter," nor does it detect ISPs (Inter Sample Peaks.. if that's a problem).Try Sound Forge Pro's two-stage 'Wave Hammer', LoudMax or the Kjaerhus Audio Classic Master Limiter, there are many others.. free or otherwise... search.
btw, welcome to the Magix Sound Forge forum @denver-s.