Yep, we all have these kinds good/bad streaks.
In some of the games, it isn't our fault we lose.. but most of the time there's something we did/didn't do individually to change a losing game into a victory.
Looking at your op.gg, I suggest you take a step back and look at the replays of every game--whether it is a win or loss.
There's many points in a game where we--individually--do not use our time/lead efficiently.
Taking an educated guess here, but--after looking at your op.gg--there's several games where you popped off (in other words, you had a giant lead) and still did not win--I believe you might want to work on your understanding of using any lead effectively.
If you work on using your lead effectively and watching your game replays, you will be able to fix key issues and proceed to climb again.