Brief Answer:
Let it remain low
Detailed Answer:
dear sir, hi and welcome to Ask A Doctor . though u have not mentioned the type of carcinoma thyroid u had, but as an old school of thought, we overtreat post carcinoma cases and keep TSH LOW . it is called suppressive therapy. and try keeping FT4 ON HIGHER SIDE. if u are not having tremors, palpitations or weight loss, continue the same plan , do not try to bring TSH UP.
to avoid bone loss, add calcium, vitamin d supplements
I have gone through your reports. u have diabetes as well . but your hba1c is controlled .so continue same. CBC is also normal. and TSH FT4 AND FT3 ARE ACCEPTABLE
regards!