User blog comment:Mineko Charat Lucky/What makes Platinum players different from Gold, and Diamond to Platinum?/@comment-1330314-20131027195905

This may not be entirely it, but you could definitely improve right now by training hard on other champions, instead of relying on Anivia. In the end, you should have a certain level of mastery over several different champions in every role. Just play a lot of normals with them first, and try to figure out the quirks in their mechanics. Even super-simple champions can work really well for this: Nunu, for example, is an amazing jungler, and doesn't take too much effort to master.

You also seem to be worrying too much about how to react to specific situations. Obviously, there's a certain way to do things, but the best way to internalize these strategies is to experience those situations a lot. Try out lots of different roles, play a lot more, and over time it'll just become more natural.

If you want to focus on a particular champ (even Anivia), you can also just watch a lot of pro player streams, and see how they play differently to you and how far they can stretch their champion's mechanics.

Essentially, going from one division to another isn't just a matter of learning just one super-secret skill. If you want to focus on decision-making, streams will definitely help, but so will lots of practice. Moving to a higher division is gonna mean more commitment.