You don't have to delete the post. Just let it stand and wait until other people give it a look.
Though, it does make it more convenient to show examples of your work. Nothing about showing credentials -- it's just so that people know right off the bat instead of needing to search through your posts, you know? Just makes it easier on you and them.
But if you're going for a surprise element, that's chill too. Don't think this is really something to delete a post over, but eh.