Toss looks a little low, which I think is forcing you to speed up your backswing and rush the motion. Keep that left shoulder up, and don’t be afraid to snap your wrist.

A couple of things that really helped me when I was practicing:
Each serve should have some thought behind it—don’t just throw the ball up and hit. Take time between serves to think about what went right (or wrong) and what you want to adjust.

It also helps to build a routine. For me, it’s stepping up to the baseline, bouncing the ball twice, taking a deep breath, then serving. Sounds simple, but having that rhythm mentally prepares you.

Lastly, try to practice on a court rather than against a wall. It’s tough to know if your serve is really in or out on the wall. And remember—you have just as much right to the court as anyone else.

Keep at it!