Sounds like you don't get high enough, because you don't load up well enough?
I assume you land at your back in the water?
1. aim downwind to gain speed
2. load up - stretch your lines - create linetension by turning upwind a bit
3. edge and turn upwind more and you should take off
Start doing this. Just make small wakestyle jumps of the water to get the timing and feeling right. The better your timing, the higher your jumps.