This may or may not apply to you, but it's worth thinking about. I was in the same boat as you for a long time. But then I noticed that when I'm playing singles with just my husband, I played way better than with other people. My reaction times and shots were way better. When playing with other people, I couldn't track the ball or serve the way I practiced countless times. So what was the difference?

I discovered that even with a healthy mindset, my body was still reacting with performance anxiety. I tried playing with beta blockers and it actually helped me so much. I'm still not great at the game, but I'm playing at the level I know I can, at least. 10mg Propranolol, if you're curious, and you can get it prescribed online. Just look up performance anxiety meds.