How to rank up?

I been for the past 5 months been taking lessons and looking at I do not know how many way's to improve my playstyel but im still the bottom of the EUW server, if doing everything all dimond and challenger players tel me to do to rank up and even had a korean Dia 2 guy helping me for about 2 weeks and still the bottom on the server, how can one rank up anyway's. No matter how much I learn and try to improve never move a single feet in the ladder. Any advices?
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