How do I ask for an informational chat? - 6 months and counting

I sent 15 messages on a professional network and got two replies. I am in Dallas, in case local advice matters. Some people reply with short answers. How do you phrase the request?

Follow up with a thank-you and a short update. One of my chats led to a referral a month later.

Do not apologise for asking. Most people remember someone who helped them.