How do I ask for an informational chat? after 16 years as a procurement assistant

I sent 16 messages on a professional network and got two replies. It has been weighing on me all week. I worry about bothering people. Did any turn into leads?

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

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