I just looked at your stats.
You look to be a Yasuo main and a Malphite main and you play mostly mid or top?
You win games when you personally play within your comfort zone and most of your losses look like they come from when you play any other champion but those two.
Your CS looks good with Yasuo, as does the KDA, and win rate. Anything above 55% after several games (40+) you can climb with in your Elo.
Things I noticed, but it is hard to say exactly if this is true:
- You die a bit too much with Yasuo on average - even one less death per game will make a huge difference
- Your CS with Malphite is pretty low - unless you are playing support or jungle malphite, it should be way way higher on average than 120ish
- You lose most of your games when you don't play these champions - so keep playing them mostly and avoid other champions
- Your rune pages are bad - You are running % health runes, those are terrible. Stick to a standard page damage/attack speed reds flat armor or scaling health yellows and either MR blues or CDR. Your quints should be probably damage with Yasuo and resistances with malphite. You can adjust your page to fit your style if you want, but try to optimize your runes. Yellew should be defense, Blue should be MR AP or CDR and Reds should be damage or Attack speed.
- On your mastery page I don't think you should have anything in the ferocity page with malphite - you should be in the cunning tree with your leftover points
- You should be building
on 
every game. Almost every Yasuo player I face top or mid builds this. You don't have it in any of your builds
- A lot of Yasuo's build
over 
but maybe the meta has shifted for him recently
- You may want to learn a "safe" mid laner if Yasuo is banned and begin playing them more often - it appears you don't really have a plan B and just play whomever
You might just not be playing enough Yasuo to climb maybe OR you are not taking objectives.
I can ball park that you get kills early, roam some after taking your mid tower, and then you proceed to mostly split push the remainder of the game? I only say this because you CS is pretty high, but maybe this doesn't always equate to wins (your towers taken are pretty low if you are splitting).
If you are splitting most of the game then it explains your high CS, if you aren't then your CS is better than the average Bronze player. I will say that you should learn another champion besides simply because he is banned a lot AND when league hits 10 bans you probably rarely play him.
