The fix should have happened when it was young. Next time top and lst as it's growing. You can also pinch off the lower limbs when they are tiny, but most just spread them out so they catch more sun. But if it's still vegging, pull the plant over and tie it off. It will bend quite a bit, but don't break it.
Looks like you could use a little more sun too. Searching for light will make it lanky.