Hey Reece, ok so I think a lot of the acceleration comes from being relaxed and having a good amount of body rotation and weight transfer so the arm can stay relaxed and generate speed through the contact and shot. So make sure you aren’t getting tense as you hit through the shots, try to focus on being loose especially in the upper body.
Also I think trying to get a slightly longer back swing can help you feel like you can accelerate through the stroke quicker, so I wouldn’t necessarily recommend any specific drills but there are a few things to think about and focus on there. Hope that helps!
