Say, you're an English teacher, and you really enjoying teaching English.
Can you say something like this?
I'm the happiest at what I'm teaching.
Does this sound natural or even grammatical?
It could be better. I would say: I'm [at my] happiest when I'm teaching. After all, you are not comparing yourself with other people, are you?
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It could be better. I would say: I'm [at my] happiest when I'm teaching. After all, you are not comparing yourself with other people, are you?
CB