A 38-year-old woman on levothyroxine 75 mcg daily for Hashimoto's thyroiditis presents for follow-up. She reports persistent fatigue and weight gain despite compliance. TSH is 0.2 mIU/L (normal 0.5–5.0) and free T4 is 1.9 ng/dL (normal 0.8–1.8). What is the most appropriate next step?

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