That’s a very broad activity, being the “best you.”
Why is one doing it? For selfish reasons and gain? Then it could be an expression of sin.
Because of pathology? Illness is not a sin.
So you can serve better? Probably not.
Can you be more specific about the circumstances that are of interest? The term “perfectionist” in the question suggests an extreme in the behaviour, but when I flew for a living, I sure tried to be a perfectionist on the flight deck!
Blessings,
Gerry