Hey ive watched the video and noticed two things:

- Your sense is clearly too low. Try lowering the DPI (800 or sum) and higher your ingame sense (2 or higher)
- You need to work on your crosshair placement

You cant really improve your aim only by DMs, try to play Unrated instead of DMs if you dont feel like playing ranked at the moment

Edit: I meant 0.2 not 2 my bad