Coco fiber substrate like Ecoearth or Reptile Basics works really good for humidity. Mixing some moss in with the sustrate works amazingly as well, I also make a little hedge of moss around all the edges of the tank but the front and spray the moss directly when I spray the tank.

Putting a damp rag on top of the hot hide (Or both if the humidity is low enough, I normally just do this for sheds) works really good as well. Just take it out and rewet it every other day or so and on the days I don't rewet it I just spray the rag directly as well when I spray down the tank

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