Welcome To You and Kiwi To The Forums!
Ok, so I’m guessing with all of what’s going on in the world right now, you can’t get out and buy proper equipment. But go to the resources tab on the left of your screen and read through most of it. You’ll be able to get a good idea of Cham husbandry. As for what you can fix right this second, you need proper lighting which is the number one thing that’s jumping out at me. You need a T5 HO strip and a incandescent house held bulb, both you can order online.
I would take out the rock ( just put it on the outside of the tank, Its super cute) in fear of your cham getting burnt on it. Try to make different levels with the sticks and go out side to see if you can find some more, you want to mimic the top of a tree, since chameleons are arboreal. Take out the green mat at the bottom because it is a breeding ground for bacteria. You have tons of moss, try to find a pothos or some fake plants for more coverage. Use the moss to make more hiding spots, the colors and patterns your cham is showing are symbols of stress, adding hiding spots will make your cham feel more safe.
Please take your cham out of the enclosure while you are re-arranging because it would be adding un-necessary stress. And too much stress could cause illnesses. Ill Review your form, just give me a sec, if you have any more questions, just ask!