How to topspin a low ball

When the incoming ball is LOW over the net, the ones that just pass the net without touching the top of the net, i often have trouble top spinning those balls.

When i try, It just keeps going out of the table,

NOW HERE IS THE ISSUE: 

 i know that closing racket angle helps if the ball keeps going off the table, but i've gotten into the habit to close the racket angle so much to the point where the racket is almost parallel to the ground, and result in me develop incorrect topspin strokes.... i have the habit to close racket angle even when the incoming ball has less topspin.....

So is there any tips for me to fix this, other than suggesting to close my racket angle.

What i am basically saying is i can't get the ball to land on the table UNLESS my racket angle is extremely closed, but I want to learn to the proper topspin stroke so i don't want to use a topspin stroke where it's almost a horizontal stroke.

Hi Aaron,

If the ball has bounced over the net and is long enough to topspin then it is also high enough to make a successful topspin.

It is all about the angle of the racket and the contact.  You can also slow down the topspin a little to give yourself a better chance of hitting it on the table by having a more vertical brushing of the ball.  It is finding the delicate balance of angle and brushing contact.  It is not something that is easy but work on changing those two things and you will find something that works for you.