Optimal. And there is a good reason for it. You see Haku, you have been forcing yourself too much over the years, and it has taken a toll on your vocal cords. And I know from your exams that you have been taken excessive medication to supress the pain, but this has only made matters worse.
I hereby ask you to cease singing, lest you lose your voice completely.
Haku, please, don't look at me like that. There is a chance to recover.
Also, I want you to stop drinking too. It's not doing wonder for your throat either.