A 29-year-old male with schizophrenia was started on risperidone 4 mg daily eight weeks ago following an acute psychotic episode. The PMHNP administered the Brief Psychiatric Rating Scale (BPRS) at baseline, where the patient scored 62. At today's eight-week follow-up, his BPRS score is 48. The patient reports that the voices have decreased in frequency and intensity but have not fully resolved. He is able to maintain basic self-care and has returned to his supported employment program, though his supervisor notes he remains socially withdrawn. He denies medication side effects. How should the PMHNP evaluate this patient's treatment response?