I think the shot is great, as I said! However you took it.
Anyway the sharpening increases the change in contrast at edges (where light and dark meet) and that is where we see/infer sharpness. I will simply give you a formula (a recipe)--i.e., do the following. And see if it works well. Actually I am a recent convert to doing it--I didn't do it for years but now have decided I should. In a way that is why I commented on yours--when I teach/explain I improve my own understanding.
Anyway I did it in Photoshop. I presume your software also does it.
1. I used saturation and bumped it up a bit. Not sure what I used as I don't normally use this (I work in camera Raw)--just put a little zip in. I may have used +30.
2. I used curve (and put an S shape) which means a little contrast--lighten the highlights and darken the dark areas.
Now the sharpening. And I am no expert as I suggested above.
3. I used Unsharp Mask, and the settings were:
Amount 12%, Radius 60 pixels, Threshold 0
This is called "midtone contrast" (by the late/great Bruce Fraser) and adds some sharpness. I think I got the values/ideas from the Ctein, here.
masteringphoto.com/the-fine-art-of-digital-printing-using-unsharp-masking-to-improve-texture-and-tonality-in-your-prints/
4. I used the Smart Sharpen and the settings were (about/not sure but looks OK):
Lens Blur, Amount 100%, Radius 0.1 pixel
This does a stronger very local sharpening. I believe I got the idea/values from Ken Rockwell, here.
Sharpening
If you don't have the Smart Sharpen then you might try the Unsharp Mask again, with following:
Amount 100%, Radius 0.2 pixels, Threshold 0
As you can imagine there are numerous place to read up on this. I found the following pretty useful (actually there several Parts I-V I tthink).
Sharpening in Photoshop -- Part II
FWIW I use iso 1600 (theater pictures for my college) w/ a K20d and no noise reduction--and am generally pleased. I think theater photog. is similar to sports photog. except the lighting is less (and uneven w/ local spots) but the shutter speeds can be longer. Maybe noise bothers me less than others but also I expose to the right (try and get the maximum exposure).