There’s a fine line of keeping the curiosity to the rest of the post + also awakening enough curiosity to make the reader follow through.

TBH, no one would bother to read something this long. I think this is a poor example:
“In 1935, a poor New York taxi driver offered some Broadway doormen a free ride home.

In gratitude, they gave him free tickets to the play “Anything Goes” and he took his 9-year-old nephew to see the show.

The boy was blown away.

He told his uncle he now knew what he wanted to do with his life — work in show business.

And that’s exactly what Mel Brooks did.”

I would instead provide a very short snippet of who the post is about at the very beginning, then start writing a story.