No, that is horrible advice. You are born with the temperament you have – no amount of will or training can change who you are.
I came across a video today on YouTube that, although good was intended (I think), I cringe at the thought of someone telling introverts to not be who they are. To be more extroverted.
This is a brief video, so it’s almost worth watching in its entirety; but I can recap it for you: stop being an introvert. Wait a minute though, because the speaker identifies with us! She is a “former introvert”! So it IS possible to leave your introverted nature behind!