Miller is in Kolkata with the Punjab side to take on Kolkata Knight Riders (KKR) in the match 11 of IPL 2017.
Miller, speaking on Wednesday (April 12) at The Eden Gardens after completing his batting sessions at the nets, said: “I lost my aggressive style in the last season. Neither was I able to perform in the IPL nor was I delivering for my country.
"But much before this IPL season, I came to New Delhi for some valuable advises from our IPL team mentor, Virender Sehwag.
"He gave me some priceless advice. He told me about his own story that I must try to depend on natural instinct while batting as he used to do during his career.
"Sehwag advised me not to care much about technique as he did not. Rather his advice for me was to try to hit whenever getting a lose ball.
"These advice helped me a lot. I am playing more freely now. I have regained confidence. More importantly, if you look at my performance in this season, you will find I have delivered a better show in both domestic and international scenario."
Commenting on the match against KKR, Miller said: “If Chris Lynn does not play against us then it should be an advantage as Lynn's devastating form has made him the X factor.
"In a similar way, We also have a cricketer who can be called X factor in our team. He is Glenn Maxwell. Both the cricketers are dangerous in this format of the game."
At the same time, Miller praised KKR's bowling. He added: “KKR has a strong bowling side both in spin and pace. Still, I am optimistic due to one positive reason. That is greenness of the pitch."