Fixing your grip comes first
Video If something ends up here, it's because it really helps you, if not I wouldn't recommend it.
It fixes your grip automatically.
It’s not an accessory, it’s a device that literally forces you to hold the racket well, this is what I give to my players when they have wrong grips.
You can watch this video where I explain why the grip is the most important part of the technique.
Coupon code: DANIHOYO10 (outside Asia)
Video