Open the image in Photoshop
Duplicate the background layer
Go to Filter > Sharpen > Smart Sharpen
Adjust Amount, Radius, and Reduce Noise
Click OK
Go to Filter > Sharpen > Unsharp Mask
Adjust Amount, Radius, and Threshold
Click OK
Go to Filter > Sharpen > Sharpen More for a quick sharpen
Use Filter > Sharpen > Shake Reduction if the image is blurry from camera shake
Use High Pass sharpening by duplicating the layer
Go to Filter > Other > High Pass
Set a small radius
Change the layer blend mode to Overlay, Soft Light, or Hard Light
Adjust layer opacity
Add a layer mask and limit sharpening to important areas
Use Camera Raw Filter for sharpening if needed
Zoom to 100% while sharpening
Avoid over-sharpening
Save the edited image