A 28-year-old woman from Delhi attends the gynecology outpatient clinic for abnormal vaginal bleeding. Pap smear cytology reports high-grade squamous intraepithelial lesion (HSIL). HPV testing is positive for high-risk HPV-18. Colposcopy is performed with 3% acetic acid and Lugol's iodine. A white lesion with irregular borders and dense acetowhitening is noted in the transformation zone. Cervical biopsy confirms CIN 3. After appropriate treatment with loop electrosurgical excision procedure (LEEP), the pathology report shows clear margins and negative endocervical curettage. What is the recommended follow-up protocol?