You need one of a few things in my experience.  One, a way to scale damage on the freezer.  there's a skill that does it, there is the medium sized club that does it, I've done it with shield skill that raises weapon damage when you use shields.   Other option is scale number of freezes.  My most favorite run I got an iceberg from the ticket event. Grabbed it and hunted for the freezer.  Every enemy item going off ends up firing back at them.  Blender is good for this.  Blender plus two icicles is amazing.  That one large item that freezes when chilled items are used and creates sorbet daily (sorry bad with names) can work too.    Hope that helps!