Unhook and get out of the foot straps.
While on a beam reach, switch stance by turning your body into the wind and shuffling your feet. Your feet should be slightly over the centerline and your front foot should be near the mast and pointing slightly forward to the nose of the board.
Carve upwind by putting pressure on the windward rails while keeping your body balanced over the board and not leaning out over the water. Extend your arms forward into the wind so the sail goes forward into the apparent wind: Use the back hand to throw the sail and the front hand to guide the sail. The front hand should let go of the boom and grab the boom end near the clew. Your arms will briefly cross.
Let the clew pass by your head, let go of the back hand, and pull clew back and down toward the tail of the board with determination and quickness. By down, I mean into the wind for the clew must accelerate to the water faster than the mast for the sail to float.
Let go (the sail will float in front of you) and step forward with your front foot.
Reach for the boom as close to the mast as possible as the board stalls in the eye of the wind. Push out with the clew hand to keep power in your sail and stiffen the back leg to help turn the board into the wind.
Once the board is pointing into the eye of the wind (or very close anyway) then pull the rig vertical and sheet in with the clew to power up the sail. Pressure your front foot so the nose of the board continues to pass into the new direction. Adjust feet, trim, sail away.