Alright after looking at your match history, and game info, heres some points.
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its not always about damage done, you can deal 0 damage to champions, and still win.
How? By taking objectives, this game can sure look like a PvP game, but in truth, the enemy champions are just in the way, and your real target is the towers>inhibs>nexus.
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Jinx actually did fine, im more worried about the 2-7 lee and 1-6 olaf.
Looks to me, that jinx stayed back and tried to play safe while their carries were able to dive her, since its sivir, she can use her shield to ignore your silence or jinxs slow/traps and bum rush her to do more damage with ori shielding her and slowing you or jinx. Thats why Sivir has 0 deaths.
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What were you doing this whole time?
You have 0 kills, and only 3 assists, thats hard to do, especially with your ult. Seems to me you stayed in lane or away from any fights. Maybe you should play a more aggressive support.
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Your history proves you do just as bad as jinx, lee, and olaf.
2-8 Karma. 0-9 raka. 3-12 leona, and so on. Everyone has bad games, even carries.
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your builds.
I see in alot of your games, you just get half your gold item, sometimes dont even get an SS, and just rush damage items, thats not your job, you need utility items. You need defense items to stay alive to continue healing/peeling your allies, and CC locking your enemies.
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dont play the blame game.
if you lose, ALWAYS blame yourself for not being good enough to carry yourself out to the next game, and continue on, you will almost never play with the same person again unless your in diamond elo, and if you do, its because you qued up instantly the same time that person did, and the stars aligned against you.
This about the only advice i can give a bronze player, i was able to finish in gold 2 last season, currently silver 3 cause im fucking around and bombed my placements, but to get out of bronze its easy, just main one champion, dont flame anyone, always ward, watch your mini map, take objectives, never get greedy, and youll climb in no time.