I am a double board certified US doctor. To answer the question you are asking, I have several angles here. Bear with me>
Methimazole is often not a cure for hyperthyroidism. I see that you already have a dignoses of Graves disease.
Often what is needed in Graves disease is thyroid ablation.
You are not on a maximum dose of methimazole, and the choices are to increase the drug again, give it a while., or go to ablation of the thyroid.
Hopefully, you are working with an endocrinologist.
I am a double board certified US doctor. I have taken care of thyroid patients for over 20 years.
Ask your doctor:
should you stay on a higher dose of methimazole for a while then taper more slowly
should you move on to ablation
Those would be the main questions.
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Let me know if you have more questions.
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