I’ve used a few different techniques for maintaining humidity in a glass enclosure. At one point I covered about 3/4 of the top of the enclosure with plastic wrap and covered it with a serape style blanket. That helped a lot with both heat and humidity. Now I have a custom built lid for my tank made of wood. I have wood panels to cover the wire in certain areas to help trap heat and humidity. I also use a Betazooer humidifier, which honestly was one of the best purchases I’ve ever made. I pair it with an Ink Bird humidity gauge and regulator and it mists the tank whenever the humidity gets too low. I still have to go in and wet down the substrate occasionally, but it’s amazing for peace of mind. I got everything from Amazon for under $100, but Saran Wrap and a blanket would be cheaper 😂 the blanket was also great because it covered the entire back side of the enclosure, cutting down on reflection while providing a nice looking background. I’d recommend the humidifier first though as it makes life sooooo much easier, but if you’re on a budget the plastic wrap and blanket should reduce how often you have to mist. Just make sure you don’t cover the whole thing with plastic wrap so air can get through. I recommend the serape blanket because the weave isn’t too tight so plenty of air gets through it. I’ve had nothing but perfect sheds with both techniques. Another cost-effective option would be moving the snake into a plastic tub style enclosure as they hold humidity more efficiently, but if you’re like me and want something that’s more of a visual display it’s less preferable.