I found a problem with YOU already, not your team.
Your personal score doesn't matter, your grade at the end of the game doesn't matter, your KDA certainly doesn't matter.
When you only play to have good stats and hide behind a facade of "look how much better i do than them i went 10/2 and they went 0/5 this is all their fault" is when you lose the most. Everyone has bad games where they get completely bodied, and everyone has good games where they absolutely dumpster the whole enemy team.
When you can start consistently outplaying the enemy and working with your team to a successful extent, you will start climbing. There is no question to it, it's proven that if you're better than where you're at you will eventually move up.
Stop worrying about your "insanely good kda" and worry more about what you can do with that kda to help your team.