Oh dear, @dotremain. That’s right. Many things can be “fixed” in post-processing, like exposure, color and noise. But focus is not one of those things.
How to troubleshoot the lack of sharpness completely depends on the kind of blur. Can you tell if the blur is from camera shake or subject movement? Or does it appear to be miss-focused, tack sharp behind or in front of the area you want to be sharp?