It’s going to take time since you have never pitched. You are throwing with only your arm right now. Your lower and upper body mechanics are not helping you deliver any energy to the ball. I’d focus on how you come out of your leg lift. Try to achieve an equal and opposite position into foot strike with your foot landing flat instead of on your heel and not rolling your toes to the 1st base side of the target line.
We’ll discuss arm action another time.
You have a lot of work ahead of you if you are serious about pitching. Stay focused.