If u are really good at a mechanic and notice that that one thing gets u a lot of goals and creates a lot of chances for your team then I suggest practicing that mech and mastering it as I have seen this has helped me and many other players to rank up pretty efficiently but I do recommend u to become a more well rounded player when u reach higher ranks (champ and above I would say )this is very efficient as I have found but let me know ur thoughts on this and what works for u