The analogy I use is this :
The Swire approach to a plant that is dying is to continually prune it back until it starts to recover. Cut, cut,cut and hope for the best.
What is needed is to re-pot the plant with new soil, change the watering regime, place in a different ligh/sun environment and tend to it's needs.
Also very important not to overfeed with fertilizer.
Time to change the gardener.