Welcome! Best advice I can give you is to put it outside. This is a very weak tree. It needs full sun and good soil. These ficus are often potted in some pretty moisture heavy material.
If it was mine, I'd carefully water it to be sure it doesn't rot out, and keep it outside until it pushes a new big flush of leaves. Once it's there, I'd repot into good soil.
Have fun, and get more trees!