Putting the ball away
I really need some help here guys.
I'll try to make my story as short as simple as possible. Basically, I'm a player that uses a lot, and I mean a LOT of topspin, to the point where my shots have a lot less power on them. I also use a short backswing. As a result, I never really worry about hitting long, and I just worry about picking my spots and not hitting the net. I also have very low stamina, no matter how much cardio training I do.
When I play points/a match, all I do is hit the ball from side to side and move my opponent around. I'll keep doing this, hitting very good shots, and the ball will just keep popping up back to me slowly, I'll hit it to the other corner, it'll pop back slowly, I'll hit it again, etc. Basically, I will keep trying to put the ball away and my opponent will barely get it back every single time until I mess up. When I lose, it's so frustrating because I realize that I deserved to win the majority of the points, but I just couldn't put the ball away.
I also want to say that my habits are so hard to break, that various coaches were trying to change it but they couldn't because I physically couldn't change it. That's why teaching pros want my head. Anyway, I thought that a solution to this problem might be to get stronger. Is this correct?
Thanks in advance for any advice, it really means a lot.