You need something in the enclosure that can hold water. A damp towel, sphagnum moss, even a large piece of pumice.
I keep a damp towel on the top on the screened lid, and it keeps the humidity at 50-55%.
It's around 35% without it. Alternately, you can spend $30-50 on a humidifier just for the enclosure, but those can over-humidify pretty easily if you're not careful, which can lead to respiratory infections.
50% is a good target for normal operation.
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