"I need help." -Teynor 2017

I've been playing ranked recently, and the highest I've been at is Bronze 4, about 50 LP, before having a long losing streak, getting demoted to Bronze 5 again, and going right down to 2 LP. After that, I climbed to 90 LP, then lost it again. I'm now at Bronze 5, 3 LP. I've been trying to carry from Top and Support, but it's not working. I get good scores more than 70% of the time, but for some reason I still cannot win games. I now feel that it is impossible to get out, the fact that I've been so close (to Bronze 3), but been pushed back down doesn't help me. Maybe I should just quit, leave the community to it's own devices, spend my time playing another game. Or maybe I should take a break for a while, I have no LP to decay away anyway, I have nothing to lose, and come back later, with a fresh mind. My time is often a really flame ridden team or someone goes AFK or someone feeds. I will admit, that sometimes that someone is me, but not every game, not even most games, maybe 10% of the games are lost because of me playing awfully. Please send help for a hard stuck Bronze. ANY tips would be appreciated.