Getting expert advice for what you're struggling with is amazing, but what can you say or do to make the talk not only beneficial to your side? How can you repay the favor when you're not the expert?
Two main things:
1 - has been mentioned below, which is give feedback. Do it publicly (on their website, LinkedIn, etc.) and if possible give a brief case study. In other words state how you met and how they helped, how your life is better after acting on their advice.
2 - provide a further introduction. Introduce them to another potential advisee, client, or even an expert from they can get advice on a different topic.
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