How do I ask for an informational chat? - 9 months and counting

I sent 10 messages on a professional network and got two replies. This is my first time dealing with any of this. I want advice, not a job directly. How do you phrase the request?

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.