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This is a long story but please bear with me I'm new to this. I was given a ficus ginseng as a gift in November of 2020. It was purchased from Lowe's hardware I think (very bad idea I know) . For the first few days leaves started dropping due to what I thought was an issue with the winter temperatures. Then I noticed fungus gnats and larvae in the soil, did some research, and I saw that the tree was put in potting soil which was causing root rot and lots of sitting water. Drying the soil out became impossible so I re-potted the tree into some new soil and applied some neem oil. I saw some new growth but leaves continued to fall, even some of the newly grown leaves. My question is, what could be the issue now? Do I need a full spectrum light? A humidifier? Is root rot still an issue? Temperature? Was the re-pot a bad idea and did I mess up? I'll include some shots of the recently fallen leaves and before and present pictures. For background info my room receives about 130 lux of light on average, humidity is less than 10%, temperatures are steady at around 30-40 degrees Fahrenheit. I live in central North Carolina that should give a little more information on climate.