Tilting monitor

It is really improve my aim?

No but it’s better ergonomically to tilt your monitor 10-20 degrees back

depends on ur sitting position

I've tired both tilting and 90 degrees, I personally don't see a difference

it doesn't really improve your aim. in my experience, it does improve the feel of the game

ergonomically better and in my experience improves how you see the game which improves aim, that being said my monitor is relatively close to my face (but not like shanks or redgar)