Reason peoole get stuck in a certain division is they aren't improving in the game mechanics. Whether it's farming (my weakness), warding, trading, decision making, etc.
Warding allows you to know when it's okay to push and really harass an enemy. For example one game I played Trundle top against Aatrox. I had my bush warded and my team warded enough that when I saw their jungler bot lane I knew it was safe to engage and tower dive to get a kill. It also let's me know if my laner roams to try to help another lane so I can follow and counter gank.
Past laning phase, it will let you know anyone caught out or those trying to flank your team from behind. It can let you know when they are preparing for Baron or dragon. Let's you know when you should back off a tower or can get the tower.
It's hard to give improvements elsewhere because we aren't watching your games. I can't say if you're trading good, or if you're making good decisions. That's why you're not getting pages and pages of help on what to improve on.
Download plays.tv it can record your games and you can upload to YouTube or just rewatch on your own. I do this with all my videos and ones that I knew could have gone better, I have my boyfriend watch (who is higher rank then me) and have him point out what I could have done differently