Focus is a function of distance. So technically cannot be 'changed'

Sharpness is a function of edge contrast. Of light and dark.

Sharpness can easily be that something 'in-focus' might appear less sharp.
Sharpness is illusion that's highlighted by creating an edge of bright & dark lines.
Focus happens when edges are narrowest. Sharpness happens when edge contrast is highest.

Not the same.

The digital capability can do many things but cannot change focus. Only Sharpness.

If you look at the detail of Steve's orginal photo that is actually in focus, it decreases in definition as
as the artificial 'sharpness' of other areas increase.

At the risk of being pedantic, the sharpness of something actually in focus can be digitally (albeit artificially) enhanced.

There's very little you can do with something that's not 'in focus' to begin with except manually add
add details not there to start with. Digital painting or if you will, which certainly takes enough expertise to be an 'artform' in itself.

Best and easiest option is to make sure you select the right lens, the right aperture (depth of field) and shutter speed when you take the photo.

Jusy my two centavos

Sorry to be so serious.