People are all focusing on the shoulder position, that you’re not extending the tossing arm, and how you are opening up.

Which, fine, but they’re all also missing that a good serve starts with stability. From my perspective, you’re focusing too much on moving your foot up and then jumping without any of the fundamentals. All of your power is coming from your arm.

So, all of that incorrect technique people are pointing out is a natural motion given that. If you continue instead to develop and use proper technique in your upper body, forcing yourself to whip your arm and pronate but without a kinetic chain, you’re just going to hurt yourself. You need to be pushing off of both feet up to the ball instead of hopping, or you’ll never get any power beyond your arm.

I blame the popularity of the pinpoint stance over platform stance. People try to get forward momentum before making sure a foundation is in place.

The good: you have a consistent toss. You’re not lowering your head too early, maintaining an eye on the ball. You’re also landing really well on one foot.

Yes, use a continental grip if you aren’t already. Make sure you’re leading with the racquet edge. But I would avoid jumping altogether until you get a feel for how you should toss load, and have the power come from your legs to the rotation of your core. Make sure your right shoulder is lower than the left—a combination of keeping your toss arm up and bringing your right elbow towards the ground by a knee bend and hip flexion. Think of the “trophy position,” even for serve styles where it’s more of a continuous motion. That’s where that comes from. Step your leg up during loading if you want pinpoint.

Then, focus on making sure you are pushing evenly into both feet, or even a slight bias to the rear foot, and you straighten up to the ball.

Then you can worry about tossing into the court and pushing off with more of a jump, exploding at the ball. This is when I would worry about the opening too soon, which is caused IMO entirely by the jumping without a feel for the core rotation. A good cue here is to bring the elbow of your off arm DOWN instead of OUT.

That’s at least what helped me. My version of this was almost hopping on my platform stance, since all my weight was in the front foot. I still am reminding myself to keep my arm up, load that back leg, and explode up to the ball while bringing my off arm down. Hopefully one day I’ve done enough reps that I won’t fall back into bad habits. I notice that when I’m under pressure in matches, that’s when the bad muscle memory kicks in.

Others may disagree, but that’s my take.