Much of what you have been doing is good but there are some things you should change for him.
Lathis gave you some very good advice.
He is right that too much D3 causes a loss of appetite (and some other serious problems).
If your cham is allowed to drink more often and drink as much as he likes, it may help his body to excrete the excess D3.
Feeding - always crickects and rarely cocarach and super worms! like 3 or 4 per day at the middle of the afternoon
It may be difficult where you live but it is best if you can feed him as many different types of insects as possible.
The insects will be much more nutritious if they are fed nutritious food before your cham eats them.
https://www.chameleonforums.com/care/food/
Silkworms, Phoenixworms (black soldier fly larvae),flies and moths would all be good additions.
Flies and moths can be good to tempt chams into eating.
Supplements - zoomed calcium with d3 only 3 day of the week!
These are important--especially if your feeders have not been fed nutritious foods.
It is important not to give too much D3 and multivitamins---- but both of them, plus plain calcium are necessary.
He needs calcium without D3 the most--every other feeding.
Like this one:
http://lllreptile.com/store/catalog/reptile-supplies/vitamins-medicines-and-cage-cleaners/reptile-calcium-and-vitamins/-/rep-cal-calcium-without-d3/
Only 1 time each month calcium with D3
One time each month multivitamin
Like one of these:
http://lllreptile.com/store/catalog/reptile-supplies/vitamins-medicines-and-cage-cleaners/reptile-calcium-and-vitamins/-/zoo-med-reptivite-without-d3-2oz/
http://lllreptile.com/store/catalog/reptile-supplies/vitamins-medicines-and-cage-cleaners/reptile-calcium-and-vitamins/-/rep-cal-herptivite-supplement/
Watering - moonson like 1 o 2 per day and he always driking when i mist him!
Misting more often and/or adding a dripper may help him to eliminate excess D3 from his body .
Cage Type - screem cage 60x50x40
A screen cage is good but, if the cage is 60cmx50cmx40cm (which is about 24x20x16 inches)--that is truly too small for an adult male.
45x45x90cm (18x18x36 inches) is the smallest size cage for an Adult
Even though Jackson's are not large chameleons, they do need a larger cage.
Lighting - exoterra 5.0 bulb and on everyday for 10 hours
It is very important that the UVB bulb is replaced every 6 months. The bulb will still emit light--but not enough UVB light.
Light passing through glass windows does not contain UVB. The UVB gets converted into heat when it passes through glass or plastics.
10 hours to 12 hours of UVB light every day is good.
Temperature - i'm from south america so we dont have stations here, between 27-29 in the day and 25- 23 for the nigth.
If the 27-29 degrees is the temperature under a basking light--that is good.
The areas of the cage not near the light should be 21-26 Celsius.
If possible--a nighttime drop in temperature of 6 to 9 degrees Celsius is beneficial.
Humidity - Between 60 - 70 and up to 80 - 85 when i mist! i trying to use the humidifcar but he dont like when i on it he try to scape from the cage
He probably does not like getting sprayed with water directly.
A larger cage would allow him to escape the direct mist.
Placement - is on the table and its in front of a window but i live in 4 floor so he doesnt see anything that could cause stress
A problem with cages located in front of windows is that they may become very hot if the sun shines through the window.
Jackson's do not like hot temperatures
This caresheet has more information:
https://www.chameleonforums.com/care/caresheets/jacksons/
I hope that you are able to make the changes and that your chameleon regains his appetite and good health.
