Just stop caring about your elo.
I mean, I have games when I do insanely well, and my team just derps and I lose. I have games when I derp and I get carried.
Either way your elo is a really irreverent number... I have a few friends who are platinum who have smurf accounts that they cannot get out of low elo, however their main accounts are in high elo. If the elo rating system was a true measure of ability, then there would be zero discrepancy among the rankings of various smurf accounts by the same player.
Just play it like a game, that's all LoL is anyway. The only real reason you would want to have a high elo is if you wanted to write a guide and have it featured on solomid, elgeu, lolking, mobafire, or something like that. I mean, at the end of the day even if you increased your elo you would just want it to keep going up, and then you would be in a never ending battle lol.