A PMHNP is hired to serve as the psychiatric consultant in a collaborative care model within a large primary care practice. The care manager contacts the PMHNP about a 63-year-old man with type 2 diabetes and newly diagnosed major depressive disorder. His PHQ-9 score is 15 and he was started on sertraline 50 mg by his primary care provider 6 weeks ago. His PHQ-9 has decreased to 12. What is the PMHNP's most appropriate role-consistent action in this model?