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’ve been playing most solo for the past three weekends, and the amount of times I have 1v3d is probably in the hundreds. The amount of times that I win a 1v3 because I just get into 3 consecutive 1v1s is insane.