A 16-year-old male is referred by his school counselor for evaluation after being found using a cannabis vape pen on school grounds for the third time in two months. He reports using cannabis daily for the past year, describing it as helping him relax and sleep. He denies use of other substances and has no psychiatric history. He is currently making passing grades but has declined from the honor roll. On interview, he is cooperative but states he does not believe cannabis use is a problem and sees no reason to stop. His CRAFFT screening score is 4. The PMHNP is developing an initial treatment plan. Which of the following best represents the most appropriate therapeutic approach?