Cold messages to people in my field, do they work? - first time posting

I sent 9 messages on a professional network and got two replies. I would rather hear the honest version than the polite one. Some people reply with short answers. What did you ask?

I wrote three short lines: who I am, why them and a small ask for fifteen minutes. About one in four said yes.

I asked what they wish they had known at my stage. People enjoy answering that.