Hi Shaharyar,
Glad to hear from you again, Please click here to review my analysis of your serve. The lessons and drills recommended to review are:
https://members.tennisevolution.com/topics/trophy-position-elbow-the-enemy/
https://members.tennisevolution.com/topics/1-2-serve-break-down/
https://members.tennisevolution.com/topics/2-part-finish/
https://members.tennisevolution.com/topics/bend-the-arm-drill/
Best,
Herman Krackow,
Head Coach