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 would throw connection into the mix here for this discussion. I'm on xbox and am predominantly put into PlayStation majority lobbies for some reason. I go from some games having good hit detection to games were my shots have no hit registration. It becomes very difficult to adjust your play style around this,where your shots don't do dmg but it feels like you get one shot. Worth thinking about