Answer: Too often, once root rot has set in due to overwatering or poorly drained soil, the plant continues to deteriorate even though the conditions have been corrected. Based on your description I think you have done the best that can be done. There is a possible exception of watering even less often, in that if the plant is rotting and unable to use much moisture it will need even less of it. Ideally you would water just before the foliage begins to show signs of dehydration (faint wrinkling and a dull color.) You might also consider taking a few tip cuttings to salvage a clone of the original plant in case the worst happens. I'm really sorry about your plant.
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