Improving your aim in Overwatch takes time and practice, but there are some tips and techniques you can use to help you get better. Here are a few tips that can help improve your aim overall: 

1. Adjust your mouse sensitivity: Experiment with different mouse sensitivity settings until you find the one that works best for you. Lower sensitivity can be better for more precise aiming. 
2. Use aim training tools: There are many aim training tools and exercises available online that can help you improve your aim. Examples include Aim Lab, Kovaak's FPS Aim Trainer, and Aimtastic. 
3. Practice in the training range: The training range is a great place to practice your aim on moving targets. 
4. Warm-up before playing: Take a few minutes to warm up your aim before jumping into a game. This could be by doing some aim training exercises, practicing in the training range, or playing a few rounds of quick play. 
5. Use crosshair customization: Experiment with different crosshair styles and colors to find one that works best for you.

For Hanzo and Widowmaker specifically, here are some additional tips: 

1. Hanzo's arrows have a slight arc to them, so aim a little higher than you normally would to compensate. 
2. Use Hanzo's sonic arrow to reveal enemy positions and predict their movements. 
3. Widowmaker's scope is powerful but also slows down her movement. Try to anticipate enemy movement and position yourself accordingly before scoping in. 
4. Widowmaker's grappling hook can be used to quickly escape danger or get to a high vantage point. Practice using it to move around the map quickly and efficiently.

Remember, improving your aim takes time and practice. Be patient with yourself and keep at it, and you'll see improvement over time!
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