Humidity in dubia roaches enclosure

Does anyone have any tips for keeping humidity high in the 24x18x36 dubia? I finished building it for my crested and have started growing plants in there, but have really struggled with keeping the humidity high, so the moss is unfortunately really struggling. So far, I have put waterproof tape on all the outside seams besides the door and hvac taped about 80% of the top besides the lights. If anything has worked for anyone else, LMK, thanks!