If you want to get out of Bronze Five, you need to focus on your csing, as said before, think of your primary goal is to push back all of the minions and get the gold, and your secondary is keeping safe and/or eliminating your lane enemy if you're top, it might help a bit. Also, don't flit from champion to champion, play 50 games on one champion and learn their ins and outs, you may not master then, but you'll have a really good understanding of what to do. Uhm, build according to the situation.
I've noticed from your match history that you tend to build damagey on any champion, going straight for some sort of AP item or damage item, but a lot of the champions I've seen actually need basic items before you rush those. (Then again, most of your games are ARAM, but you should always go flat tank in ARAM unless you literally have NO offence at all. (You shouldn't build Runaans on Quinn, Try BOTRK.)
Edit: Even though you have a lot of kills, if you have a similar amount of deaths, it just doesn't work. You want to live and not feed the enemy, and unless you're going to die either way, you don't want to make rash decisions and get a kill just to die because you dived 1v3 and killed the person with 200 hp.