Hi Shaharyar,
Please click here to review my analysis of your slice serve. The lessons recommended to review are::
https://members.tennisevolution.com/topics/toss-toss-the-ball-more-to-the-side/
https://members.tennisevolution.com/topics/swing-path-bring-the-shoulder-around-more/
https://members.tennisevolution.com/topics/finish-curl-the-hand-on-the-finish/
https://members.tennisevolution.com/topics/the-sidearm-special-drill/
Herman Krackow,
Head Coach