Because I have all the champions up to riven unlocked, along with like 8 others out of the ones from riven to aatrox.
Hence why you are in bronze.
Your excuses aren't helping your case at all, they just make you look even worse.
you - 'wah wah, getting promoted is all luck'
everyone - 'uhh.. you can do this, this and this to dramatically improve and hard carry more of your games to get out of bronze'
you - 'none of those things matter that much'
everyone - *blink*
You used all your IP to buy most of the champions, when hardly anyone who wants to move up in rank does that without a solid rune page (or two) for their main role(s) first.
Wait.. excuse me, that's not true.. Shitty bronze level players do that because they think they are good at a champion after playing them 3 times and having one game where they got super fed and steamrolled everyone.
When you watch a pro streaming who specializes in a certain role, such as Voyboy or Dyrus in top lane, they often have multiple rune pages for a single champion to help in specific matchups. 13ish more armor or MR against certain champs is the difference between snowballing or feeding. It's why someone like Pantheon mid is a pub stomper in solo queue, but shitty at higher level ranked or with pros, because a lot of mids will go with MR runes, no armor runes, and he punishes them early game for it. Plus, shitty mid players will build the same way rather then buy a cloth armor as their first item, because that's what they are 'comfortable' with.
Bronze just feels like there's more luck because every game snowballs one way or the other, so it feels like you had no control. 90% of games at that level can be decided by the 5 minute mark, or whoever gets the first 2 kills. A guy who 'feeds' likely isn't as bad as his score looks. Most of the time, the first kill or two was really close but some small misplay let the enemy get away with a sliver of health. So, they just got a kill, or two, behind and want revenge.. but they keep dying to the edge the enemy has on them now unless they get some additional help from another lane or jungler before it gets out of hand.
Play champions that are really good in the early game, play very aggressive, get first blood in the first 3 minutes consistently and see how much 'better' your teammates are overall now.
Also, DS theory ftw!