Glue or bobby pin another section to your wrapped section and construct your Leia buns. The easiest way to do this is just to wrap the hair around horizontally and then glue or bobby pin them into shape.
Note: Wrapping the hair doesn't give you the exact same "cinnamon bun" shape as the hair Carrie Fisher wore. If you want to do movie-accurate hair, you'll need to twist it into a rope braid, glue the braid together, and then affix it to the earmuffs. It works, but it's a lot more time consuming.