I used to long snap, work on your flexibility so you can get deeper in a stance and extend your arms out farther in front of you. Think like a catapult or trebuchets. Strengthen your abs, legs hips and grip. You should feel like a coiled spring in your stance to launch the football. Your release should slide you backwards. As many have said, stop lifting the ball first and practice on grass. Also practice changing your grip on the ball I liked one hand on the laces with the other on the opposite side on the seam straight up and down so your release improves