Your consistency will improve when you are able to focus on the ball as it contacts your racket.  You should watch the ball all the way to contact.  Many players repeatedly say to themselves, “Watch the ball!  Watch the ball!”  However, they still don’t watch the ball until contact.  So how can you train yourself to concentrate more on the contact point? 
 
You can best accomplish this by making the task more difficult.  Instead of using your normal racket for a practice, try playing a fun match with everyday objects like a wooden spoon or a plastic cup or a cell phone or a watch or a roll of toilet paper.  By using these objects instead of your racket, it will force you to concentrate more and actually watch the contact point.
 
If you don’t have a table at home, spend 10 minutes per day at home bouncing the ball on the edge of your racket.  At first it seems impossible.  But by the end of the week, you will become skilled at bouncing the ball on the edge and you will improve your concentration.