One easy trick is, just step up to the 5th and see what happens.
But... not that we shouldn't strive to overcome our limitations and weak spots, but I recently heard Emmylou Harris point out that our limitations define our style. Not all songs need choruses -- that's just a convention. Maybe your style is more of a Kris Kristofferson/Bob Dylan storytelling style. That's pretty good company to be in, IMO.
"I got this guitar and I learned how to make it talk."