A good way to convert on 3rd & (1-10) is to call a bunch/snugs/tight formation. This will throw off the defense if they're in a blitz. Good players will usually call a zone blitz, or Man blitz with High Press DB's.
3rd & Short
Snugs Flip - Stick
3rd & Medium - Any Rollout PA from a bunch formation
3rd & Long - Any Play with Deep IN Routes or a Screen Play