Hi and welcome to the forum.

Regardless of how small he is, that enclosure is much too small for him. He will be needing a much larger enclosure of a minimum of 2x2x4’ and it would be okay to put him in it from now. The main concern with putting little chameleons in large enclosures is that they will be able to find their food. Setting up a feeding station of some sort will help with that and he’ll quickly learn where the food is. I use the shooting gallery
https://tkchameleons.com/products/shooting-gallery?variant=30018608595032 and even made my own for a new cham.
Having more branches and plants (preferably all live and safe) will also benefit your little guy. They are arboreal and you’ll want to recreate a forest edge type of environment for him.
Correct lights and supplements are absolutely essential. For uvb the standard is a linear T5HO with either a 5.0 ReptiSun or 6% Arcadia. It will need to be as long as your enclosure’s width and then about 8-9” above basking area. For supplements, you are currently giving too much D3. You want to use a phosphorus free calcium WITHOUT D3 at every feeding except one per week. That one feeding you’ll alternate between using a phosphorus free calcium WITH D3 and a multivitamin. An alternate regimen for the D3 and multivitamin is using one that is a combo (I like Reptivite with D3) that you’d use one feeding every other week.
Basking temps should be around 80f with a good temp drop at night. Ideal humidity should be between 30-50% during the day.
Misting should be for at least 2 minutes, 2-3 times a day - just before lights on, just before lights off and you can add a mid day session or instead use a dripper for about 15-20 minutes.
There is a ton of just plain bad info out there on chameleons. The most accurate and up to date site to learn everything you could ever want (and then some) is
https://chameleonacademy.com/chameleon-husbandry-program-getting-started-with-chameleons/ Do be sure to check out the species profile for specific keeping guidelines. You can also check out Neptune the chameleon on YouTube.