LST - Low Stress Training.
Use cotton or those lil plastic covered wire twisty things for the garden to gently pull the plant over to the side, you can trail it all around the top of the pot if you wish, helps keep your plants a lil shorter..
just be gently and pull it over a lil every day.
BUT, i think you'll solve the problem if you get the light closer.
Make sure you get the stem stiffened up, get a fan blowing on it, or give it a gentle bend every now n then..this will help thicken the stem.
when you repot, bury the plant lower, to take up some of the stretchd stem.