Well, i'm regular footed, but its the same concept when I go left.
So what I do is when i'm going straight down the line and start losing speed, I point my left shoulder (Which would be your right) to the bottom of the wave and that makes me automatically turn down to the bottom of the wave, sorta like a bottom turn.
Then when i'm down there, I quickly go back to the top of the wave. To do this, I swing my arms to the left (Yours go to the right) sorta like a snap. While doing this I am putting my weight on my heels, and this should bring you back to the top of the wave.
Then you repeat the process as fast as you can. It just takes practice. I call this "Rollercoaster" I don't know if it is a real name of the trick, but thas what I call it. And if this does not work, which I find hard to believe, you can always pump the board up and down to gain speed, but I think it is a little unpractical and makes you go slower unless you do it right.
I know this may be kinda hard to understand, but I did the best I can. Lol

Good luck, and let me know how it goes and if it helps.
-Charlie