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Something that helped me is training with a robot and watching Franziska and Kreanga's videos... bringing the racket from the side of your hip, use de legs and and the wrist is the way to improve your topspin drive.
If you have the time or need to loop e.g. heavy backspin than starting more from the side (and using hip rotation etc.) is a good option to generate the required space to accelerate but not so much if we want to stay in a fast rally. I'm currently trying to break this habit myself and also to minimize the change of grip between BH and FH i.e. always keep a more neutral/slight BH grip (not so easy...).
Some good videos are imo:
A must-watch video for improving your backhand fundamentals—there's always a detail you've missed!