Can it be positioned outdoors, so it gets much more light and heat? But not get rained on, in case it happens to rain too much there. The media might make it more prone to rotting when gets rained on, since it is not quite gritty.
If it were mine, I would let the plant go outdoors, but reapply first cinnamon. Then let it heal/callus further the injury. Give it a week, it has to dry up that part. Typically if it were growing outdoors in summer, frequent watering is what it likes once it is awake. But if it is growing indoors, water intervals should be observed, since dry out time takes much longer, and it is really more prone to rotting when it gets quite a water retentive media while indoors.
