I barely know where to start. It is unethical to sell a Jackson's chameleon this young. It is too early to determine the sex at this point. That said lets see what we can do to help you out.
Lets start with lights it sounds like you have a dual dome light fixture. It will not provide enough UVB in that large of a cage. You will need to move to a 24 inch linear t5 fixture ASAP to prevent MBD with a 5.0 or 6% bulb. Eco smart bulbs tend to be LED and do not produce enough heat to be useful. You need to make sure you have incandescent bulbs and this young they shouldn't be too close to the screen ass they may burn or dehydrate young jacksons. His basking spot should not go over 78 F until he is 9 months old. Prior to 3 months I don't even use a basking bulb. Basking bulb does not need to be on all day but rather an hour or two mornings and on and off as needed the rest of the day off before UVB lights at night prior to misting.
Supplements my plan is not typical but has worked for several years for me. I dust with plain calcium mixed with ground bee pollen Monday, Wednesday and Friday. I dust very lightly you can barely see it on the feeders. If they are getting fed twice a day it is only on one feeding or half of the feeder bugs. Every two weeks or twice a month I substitute Repashy Calcium plus Lod for the Monday calcium VERY LIGHTLY.
There are other options but you will need a multivitamin either way.
"Calcium and other vitamins are very important to your chameleon's health. Feeder insects should be lightly dusted with powdered supplement before being fed to your chameleon. As a montane species (native to higher altitudes) Jackson's have decreased supplementation requirements compared to tropical species due to metabolism differences. Use calcium (without D3 or phosphorus) twice a week, a multivitamin once a month, and calcium with D3 once a month."
You should add an early morning and late evening misting and move your humidifier to overnight as mentioned above. You don't really want high humidity with high heat. They aren't actually jungle creatures.
There is more but these things need to be addressed first.
