That "sap" dripping from your ficus is honeydew excreted by scale insects—not plant sap. The leaf drop and stunted growth over 3 years align with chronic scale infestation.
Ficus need bright indirect light (direct morning sun okay). Water when top quarter of soil is dry. Low light + overwatering = weak plant, worse pest susceptibility.
NYC area? Professional housecalls available. Otherwise, diligent home treatment works.
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