I would have to add a few things to this. I've been in silver for a while now, and recently I decided to start playing better and actually try to win more ranked games, and I'm almost plat.

First thing is that it's good to stick to only one lane, but not only one champion. I think you should have at least two, in case other people ban it or pick it. For example, right now I main Draven, but I also play a lot of Cait, Tristana and Vayne. That helped me get over other divisions really fast, whenever people banned one of the champions I play or picked them.

Another one would be to also learn a little bit about wave control. Last hitting is great, but if you last hit until the enemy gets the minions into your tower and you miss CS because of that, it's not good. One thing a lot of people try to avoid is using their skills to take minions, which is bad. It's always better to use some mana or some skills to get another 20 gold than to lose a bunch of minions in a row.

And the last advice would be to stick to one lane, but to also play other lanes in your normal games. The reason for that is that if you know how Mid lane works really well, or how Jungle works, and you only play adc, you will learn how to dodge ganks and roams. If you know a few things about jungle, and you play top for example, you will know, more or less, when the enemy jungle can cone and gank you, so you can avoid that by staying back in those moments.

Anyway, interesting article, best of luck!