The right mindset to climb.
Alright, so I'm just coming back from a huge losing spree that demoted me a lot. I felt like I was only getting bad teams (Yes, that was part of the problem, sometimes). But in the end, it made me realise that I SUCK. Even though it's not always my fault that we lost, there is always something that I could have done better. So, I need to start working on myself and to stop worrying about others. The other players are a variable that I have no control over. So instead, I need to make the variable I have control over, myself, more impactful.
tl;dr: Focus on yourself, and not on the others. You can change yourself, but you can't change others.