If you want to win more fights in PvP, aim higher.
My son was watching me play the other day and he kept telling me to aim higher. Which I did but he kept saying "higher dad! Your not getting your headshots! Aim for the top of the head." So I started doing that and it does help quite a lot. Chaining headshots makes a huge difference in TTK. I also put Sweaty confetti on my guns so this way I have a visual (and a dopamine hit) when I take down an enemy with a headshot.
Yes this is mostly a tip for casuals and I'm sure most decent players out there know about that but I figured it would help players, like me, who are struggling to win their fight.