Should i Main a Lane or a Role?

So, I'm an Akali OTP and "sometimes" i play kata and zed and sometimes eve if jungle, so obviously I play only assassins and with the new ranked system that is coming the next season i gotta focus more on my lane since it's lane rank so I'm confused to main the mid lane should I start learning mage champions or maining the assassin role is enough to be mid main? ( i never play mage champions in ranked games didn't even tried to learn them since I'm an OTP player). thanx, and sorry for my poor English. ***UPDATE*** ==>My point is=> I played thousands of games and more than 400 ranked game every season and I climbed from bronze 4 to gold 5 by playing Akali only last season as I said I'm an otp player and I just want to know how should i try to get larger champion pool by adding more assassins (the role I'm good at) or should I add mage champions and try to learn that role? {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:84}} {{champion:55}} {{champion:55}} {{champion:238}} {{champion:28}} Current Rank: Silver 2 S7 Rank: Gold 5 S6 Rank: Silver 5

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