Well, all you can do is wait at this point.
The fact that the issue here is the dehydration, not rot, it could bounce back although it will take quite some time.
Extra humidity and warmth always helps, or hasten the recovery.
Make sure the moss do not stay too wet, but never dry out either! just moist at all times.
Plus, I would trim off the leaves, maybe the most sever ones or trim off half of all the leaves to prevent too much water loss. With six leaves and not much roots left, the plant maybe losing more water than it takes in.
You could leave the leaves as they are. The plant might lose some leaves to balance the water gain and loss within itself.
One more thing is that cover the whole plant with clear plastic bag to keep mois air around the plant. Make sure there are some holes punctured on the bag to discourage the mold growth.
Place the plant at warm place even at night. It will make a huge difference!
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