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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Abandon the gimmicky builds and master your weapons. Focus on easy to use utility builds. Dont go trying to stack your radiant with a dodge, while trying to proc cascade point but staying far enough away to utilize keep away, and trying to bounce knives off walls etc etc. Thats too much to manage if youre already struggling. Get a gun that feels good. Has straight forward perks and a build that helps you survive. Staying alive is your main focus here. As soon as someone dies the other team will advance and now you're scrambling.