ok from watching the vid I assume u have a low sens as you aim fairly slowly which is fine but a few times you have probably died because of it.
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when you counter-strafe your crosshair should not be going down and up like rawzu does. I'm not sure if u watch rawzu but u need to break this habit as it isnt good and also you need to practice counter-strafing slightly faster as your holding left click for a bit to long.
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your actual precision in ur aim is very good and with slightly faster aim and better movement you could be great. When I mean faster aim I mean like moving your crosshair into place faster and not shooting the actual bullets faster then what your currently doing.
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Fix that crosshair. Get a dot crosshair similar to what derke or something uses or you could also go for a cs type crosshair like a tenz crosshair.
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When you are counter-strafing you are going way too wide so maybe try going left and right in a faster time.
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When you are clearing your corners you are blindly checking and dry swinging them when instead you wanna try something called short peeking