Hello doctor, is it possible to increase wrist power? If yes, then please suggest few ways for it.

Exercise. Wrist exercises will strengthen the power of the wrist. Wrist extension and flexion exercises with light weights or rubber bands are very helpful to strengthen the muscles. You do not need heavy weights as the wrist muscles will fatigue easily leading to improper form and possible injury.
Wrist curls. Your fitness trainer friends will have a variety of suggestions. Sometimes simplest is best -- tie a weight, water-bottle or whatever to a rod / broom handle by a cord and roll it on up, overhand and underhand. You'll be impressed with the workout it gives you.