How to carry out of bronze V?

I just played another game in which I was 21/1/9 and i did 90,000 damage with Lux in a 47minute game, twice what any other player did. I was constantly shielding my team mates, making good use of my q and e to slow and stun enemies when we're chasing and fleeing, and aimed to kill their Varus adc and Soroka supp who were the primary threat to my team while my teammates constantly aimed to kil their Garen and Galio tank first. My team only had 36 kills, 21 which from me and the other team had 43, their varus was 19/10/10. Everyone on my team fed and only I was positive and doing well. No matter how well I played, I cannot seem to get out of bronze because I get match making like this. The typical advice would be to work with my team or help them or so on, but those advice don't work when four players feed eight. I need a smurf to help me or some actual legitamte advice, not the usual from players who don't understand my situation.