Humidity problems

So my humidity randomly tanked. It went from 79 to 62. I have plexiglass cut specifically for my tank, aerators in my pools and sphagnum moss. I added more sphagnum moss around the tank. And I’m using cling wrap to seal off the areas where the plexiglass had kind of caved in creating small areas that aren’t completely sealed. I keep my apartment at 71 degrees. I haven’t been able to get it above 72%.