Hi Dipak,
Yes I can understand your frustration and its always difficult when you lose a bit of confidence a a shot or a part of your game. As you mentioned already with your serves it sounds like if you could have managed to change them up and use the jab serve ot fast serve this would have stopped him being able to push into your backhand so much of.
Also when you feel a shot isn’t going well bit it was before, try to go for the shot but focus on getting good spin which adds safety, usually when it starts to miss like you mentioned it’s if the acceleration in the ball is too slow and not enough spin or speed os generated. So concentrate on getting low,using the legs to help and brushing up quickly through the ball.
