A 28-year-old nulliparous woman with severe menorrhagia unresponsive to 3 months of combined oral contraceptive therapy (norethisterone 5 mg daily during menses) presents with Hb 8.2 g/dL. Transvaginal ultrasound shows a 3 cm submucosal fibroid (FIGO type 2) with normal adenomyosis. She desires fertility preservation. What is the next step in management?