I am concerned with shy people who believe it's innate and work harder on accepting it than changing it.

I think shyness should be challenged. Chronic introversion should be labeled as bad, not different, because it's fundamental that being able to overcome shyness as will expands the number of choices and that plainly means more happiness. (And I feel the same way about being overweight, although I am. Just because there may be a predilection to be overweight doesn't mean one doesn't haver choice it and should pretend that being overweight doesn't mean you're not healthy. If there's an overweight person who wouldn't prefer to not be overweight if there were no sacrifice to make to get to that state I think that person is an extreme outlier.)