名媛直播

I'm new to 名媛直播 and have had my tree for about 2 or three months. It was doing well especially during the early growing period. In the last couple of weeks it's started wilting, leaves are losing the glossy texture they generally have and are becoming more papery, and some leaves are even turning black. I believe it's from a root infection due to overwatering but I'm not sure. Do I use fungicide, repot it, change the soil composition? (It's not bonsai soil)

a picture would help, hard to say anything without seeing the tree, but my guess is it's inside?

Oh I thought I attached picutres.
It is inside.
Here are some images

Trees are just not made to be inside, there is no such thing as an inside tree, in the long run ( or short ) they die. So, when temps are ok bring them outside, first in the shade then in full sun. It will do much better thereand will gather the necessary strength to stay alive when brought inside again when winder starts