I don't recommend a fogger. They tend to lower temps as the fog comes in coolish. They sell misting systems, but probably not needed for a BP. I use this for my Rhacodactylus, but they need 80-90% humidity peaks with drops not too much lower.
https://www.mistking.com
Substrate, as said, is probably your answer. Also depends on cage type and heating elements used. A nice PVC cage with a water bowl will get you 50% humidity all year long.
I noticed some of these questions were asked in a previous post about temp control, but you never answered. It would helpful if you told us more about your setup.
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