I've never posted here but read a lot. Since many Dota players are young I'll throw in this advice: this same idea is what really holds people back in the real world. If you blame others and never accept that your way might not be the best, you will never be "brought in" to work with the high-mmr employees. I don't mind working with newbies so long as they work hard to improve, and if a project fails they seek ways to improve their own contribution next time instead of trying to find the one responsible for the failure. Self-driven workers of this mindset almost always collaborate without realizing it, and they notice others who share this attitude.

That guy who always has the luck even though he's not the best at his job? It's not luck, it's that he's fun to work with so he gets brought in by people in a higher bracket. This, in turn, allows him to learn the game in a way he never would have at his appropriate skill group. This continues forever so long as you are fun to work with and always trying to improve without looking to blame or simply advance for the sake of advancing.

I'm now the executive director of experimental technology for a billion dollar hedge fund and my first job was manually sorting trash in a recycling plant. I just made an offer letter to an entry level developer with zero college, no relevant work experience, but the right attitude and he brought in a demonstrable project that showed specifically that he works his ass off to learn what he doesn't know and recognize his weaknesses. I've hired dozens of people like this and it always works out better than the guy who talks about this one project he worked on at MIT but it failed because of his team.

We are all human. We all make mistakes and can have bad judgement. The important part is to recognize this and be willing to change ourselves or our processes in order to improve.