For jumps that you're already doing consistently and safely, try shorter and shorter approaches. This will help you be able to take an inside line when others are having to go all the way outside to clear a jump fairly close out of a corner. You may have to start seat bouncing to make it with a very short run.
For whoops, try different methods of going through. Try doubling through, try skimming, and try wheelieing in as far as you can.
All over the track try different lines than most people take. This will help you be able to pass in situations where most people mainly follow the "good line". Be careful on the jumps, though, because the less frequently used takeoff places usually are steeper and throw you differently than the worn down, common lines.