Surgical release of the transverse ligament provides high initial success rates (greater than 90%), but the long-term success rate is much lower than previously thought (approximately 60% at 5 y).
Probably, your nerve is permanently damaged due to chronic and severe CT sy.
You should avoid activities that put strain and excessive force on the wrists and also, if you use caffeine, nicotine, alcohol, reduce their use.
Do you suffer from other medical condition?