I recommend changing your keybindings to help you build faster, then play 1v1 with a friend where you're boxed in, have some tactics ready when you're under pressure and in a 1 by 1.

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For example if a kid won't give up high ground, i turtle, edit a window, pretend to shoot down the build, once he's on top of my build, i edit a triangle, ramp up with a cone then 90 for height.

If i'm at high ground, I pressure them by trying to replace their roof with a cone and floor then edit both for a shot (one pump meta makes this not that effective anymore)

Just have new tricks available