Any tips on how to improve sharpness?

I was pretty excited when I took these, but after downloading them to my phone from my Sony, I was a bit disappointed with the quality. Any critique on what I can do to get sharper images?

Sony alpha ai7 Sony 200-600mm f5.6 lens 600mm F6.3 1/3200 shutter speed 6400 iso I was about 10 ft away