Well, this is why I am here, asking these question to know more and get help from experts spacewood.
My tree is now sitting on the south window sill where direct sun is only from 10:00AM-01:00PM, I also changed light from 8AM-8PM (yes, also during day light).
For a month starting from now I will leave it there: no moving, no fertilising, etc., just water on the tray for humidity (I have noticed that water vaporises pretty quickly over day) and watering when soil is getting dry. I did a scratch test, and tree still has a greenish trunk, and 2 green leafs.