50% is fine. the ideal rage normally is 40%-60% it is only during shed that it needs to be higher (60% - 80%) there are many ways to increase the humidity, the easiest is to simply mist the cage more.
If you have a glass tank you can cover the top with a damp towel or foil. You can use a different substrate that holds moisture better, .....
If you have a tub (and you have drilled/melted holes in it) you can cover over the holes
for any cage a bigger water dish positioned over the hot spot (or under if you are using a heat lamp) will also increase the humidity.
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