Please stop saying elo hell exists.
It does NOT exists. It's there as a figment of your imagination, something to let your rage out on because YOU are bad, not your team mates, and not the system.
I started off this season in Bronze 3 like many other people, and made my way out of it pretty easy, you know how? Sticking to one or two champions. That's it, it's as simple as not playing champions you are trash at and can't carry with. I played Kassadin mostly and just made up for my allies mistakes by roaming, sure they might be losing their lane bot or top, but that's nothing some roaming can't fix. People feed sometimes and it just makes the game harder to win, but there is ALWAYS a way to win. This one game I believe it was like 10-30 kills with 4 towers in favour of their team, but somehow we won it when I ended up capitalizing on my enemies mistakes and eventually going 20-11 by the end of the game, I was literally able to carry my whole team.
TL;DR, find two champions you are good at and notice you win a lot with and stick to them, never stray away and you WILL get out of elo hell.
Just FYI, when I got out of Bronze I had about 10 games on Kassadin with a 90% winrate, I'm now at about 16 @ 75% WR.