A 38-yeаr-оld wоmаn hаs been diagnоsed with GERD. She reports a daily sensation of heartburn and regurgitation, waking her up in the middle of the night at least four times per week. She took a PPI, as prescribed, for eight weeks. She completed the prescribed course of PPI, but her symptoms returned soon after the course ended. The NP's best response is to: