If you are euthyroid - you are stable. How to manage euthyroid is to keep doing what you are doing with treatment that your doctor has administered for you and to test yearly the thyroid labs.
euthyroid is when you are in remission and levels stable for thyroid issues.
No one can answer that question until you basically post a history and then you will find other members will answer this post.
If possible...post a little about your history.
All the best :o)
I don't understand your question. Could you please elaborate?