Pull the disc rather than push it onto its flight path. Pulling the disc keeps the flight plate of the disc trailing behind the axis of the motion. Turning the wrist over during the release Practice a palm facing up follow through. Check your grip. Just more practice is required to get those finger muscles strengthened and the flick automatic.
Most beginners try to throw the disc rather than flick it.
Once the basics are there, the distance will Not enough accuracy Check that the grip is not finger tips only and the swing is not circular, but in line to the target. Can't remember all of the tips at once. Return to basics. Remind yourself what it was like to learn, try throwing opposite handed for a while. One mistake that people make is keeping their elbow pinned into their waist and flinging the disc forward.