As the sky is infinite, there is no limit if the sky is the limit 😀
Of course, I don’t know why this question made me remember this Einstein’s quote:
Two things are infinite: the universe and human stupidity; and I’m not sure about the universe. —Albert Einstein
… which means the universe could have a limit (and so the sky is also limited), but not the human stupidity.
That is so sad….I don’t wanna be stupid forever.

I asked this question as so many people say the sky is the limit. I just wanted some clarification on what that really means, so thought I would put it out here. Thanks for your answer.