If you're not good enough to consistently be winning your 1v1's, don't take on 1v1's
Stick to your teammates, do not play aggressively proactively, only if your teammates are clearly good and need you to play aggro with them, otherwise just play normally.
These past few weekends I have witnessed tons of players either playing too aggressively against clearly better opponents and instantly dying, or playing too passively and not pushing with us when we are, costing us the round.
Even if you are solo Q'ing, do not play as if you were alone. Learn to adapt to your random's playstyle, because you are relying on them to win.
Also, for the love of God stop running into the strand clone. I have witnessed TONS of players actively run into my clone and get punished for wanting to ape with a shotgun in hand.
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I lost a trials match today, but went positive. The better person on my team sent an invite. I accepted just for him to tell me I'm trash and to delete the game. I'm sure this happens to a lot of people, and is a reason why a lot of people don't want to bother. The toxicity of the good players kill the vibe of the whole game for some.