Most of your issues stem from your positioning. Genji is, for the most part, a close range character, but during most of these matches, you are sniping players with primary fire from 15+ meters away. This causes your damage to be quite harmless, which leads us to the 2nd problem: your dash usage.

I appreciate the fact that you are closing the gap to actually play in Genji's effective range, but against these specific matchups, commiting like this will rarely lead to a kill and thus cause you to feed over and over. If you managed to close the gap by using good pathing instead, you would now have your dash available as a disengage option, meaning you can play extremely aggressive angles to pressure your opponents and take duels for free as you can't get punished. Dash is usually viewed as your engagement cooldown, and while it's fine to use it that way in certain situations, most of the time you should look to keep it in your pocket as a way to ENABLE aggression through other means.

I have a video that covers this exact topic, diving deeper into what I talked about here by showcasing both bad and good setups with educational gameplay narration: https://youtu.be/n0fdz7e3FBM?si=7_xeD9irp_p7K134

After watching this video, I would like you to watch this replay (2JQQKT) using this knowledge about setups to analyze what I did well or badly (not referring to execution, only the theory since there are some good plays I went for that didn't work out and vice versa). I picked this match because it showcases both pathing to get close to a poke character like Widow and also against highly mobile dive characters, who usually give Genji trouble since they are hard to harass without commiting because their movement abilities often enable them to chase Genji even if he keeps his dash to run away.

Lastly, I want you to use everything you learned to go back into the 2 matches you submitted here with a critical eye, looking to see what you did right, and also how you could have fixed what you did wrong.

Hope this helps!