bend your knees and just gradually go faster. this isnt something you can learn over night it takes a lot of practice to get used to how it feels to boost a good air. for me tho its waaay too boring to just stare down a quarter and just hit that same ramp for 30 minutes so try and find lines to do to make it more interesting.
seems legit but its actualy easier to air a 6ft or 8 ft quarter for me