Pan your guitar signal hard right and hard left on two separate paths then add a slight amount of simple delay to one of the paths. Notice your thicker guitar sound?
Think of this as simulating multiple guitar tracks from a studio recording with one guitar.
If you want to go one step further, add a third signal path that is panned center and use that for your lead parts and solo sections. Combined with the Helix looper, this could make a single guitar player sound like an all out three guitar assault.