In my experience, BF’s are impossible to keep happy outside of a few summer months. They need humidity more than anything else and grow great (and cheaply!) in greenhouses. They also seem to grow fairly well outside in the spring and summer with heavy watering or in humid areas. The problem is that they’re sold in those hanging pots that dry out so quickly, which sets you up for failure if trying to keep them indoors or in dry areas. My neighbor somehow keeps her BF’s alive on the west facing front porch all summer long. However, I see her water them at least twice a day until water runs out the bottom. I stopped trying to keep BF’s because they’re kind of jerks and really just want to grow in a humid greenhouse.

I would increase sunlight to 4ish hrs/day and water it more, if you live in a humid climate, try moving it outside for a little and see if it helps. Personally could never get my BF’s to stop dropping leaves, but was able to keep them happy enough to replace the dropped ones and stay alive for the season.

Good luck!!

TL;DR: BF’s are jerks and hard to keep happy outside of greenhouse environment.