Kinda funny... Steve-O and I had this exact conversation a few weeks ago.
I simply went back to the basics, did little jumps, focussing on technique... not height. Somehow over the last few months, I had developed a bad habit of bringing the kite too far back (like 10-11 o clock) and I'd wind up going BACKWARDS after a jump.
I also focused on the ollie or (load and pop). (amazing you can easily ollie like 6 feet in the air without moving your kite at all!)
On Sat. I was amazed at how high I could get by doing a load and pop, at the same moment I did a small jump. Easily 10-15ft, and very controlled.