A 28-year-old single female with major depressive disorder presents to the outpatient psychiatry clinic. She reports persistent suicidal ideation for the past 2 weeks with vague thoughts of 'not wanting to be alive,' but denies any specific plan or intent to act. She has no prior suicide attempts. She lives alone, is unemployed, and reports poor social support. She is currently on sertraline 50 mg daily (started 1 month ago). Vital signs are normal. What is the most appropriate next step in management?