Do I need thyroid hormone if I have low free t3, (liothyronine) normal TSH and high tpo antibodies?

Possibly. The TSH is normal so it might be a variation of normal or euthyroid. It also might be a developing thyroid condition, but there would be symptoms, like fatigue. The tpo antibodies might mean hashimoto's thyroiditis. This is usually associated with hypothyroidism. It would be wise to see your doctor to follow up.
Maybe. Oral T3 (liothyronine) may be what you need. However, you should consult an endocrinologist.