In this video, I highlight a common flaw in how some players train.
A major flaw in how some players train is spending too much time, hitting forehand to forehand from one position. These players tend to have petty good forehands, but struggle when they play matches as the rest of their game is underdeveloped.
If this is you, you need to spend your training time more wisely. You should make time to do irregular drills, serve & receive drills and practice matches. This will help you develop the skills you actually need to do well when playing competitive matches.