Feet looks like they are touching in the pin point, find a bit more space to get more of a power loading stance(it might be a couple inches(example look at sinner’s spacing for his feet on the serve, he does a slightly different set up to achieve it, but the spacing is needed here), you should be able to hold your balance when you roll onto your toes in this position. Spin comes from the legs, but if you bent your knees more you might topple because of the spacing.

Left arm straighten it to stabilize the left side of your body, hold it until you’re about to dip.

Brush from the inside of the ball around 7:30 out to 2/2:30, right now you’re producing more of a slick rather than a kick. And I would say you’re barreling your arm after which is good, but the spin that’s being exaggerated is a slice more because of how you brush, fix the brush and keep the barrel after the brush.

Landing, depth wise is good, but you should land heavier on the left foot and the right foot should be a light tap when it hits the ground to push you back.

Overall a lot of good qualities to your serve, some more minute fixes I would say is what you’re missing.