If a non-Christian is suffering from chronic conditions and asks, “Why am I here? What’s my purpose?” What would you say? Have any of you encountered this?

I have an online friend who asked me this. We commiserate because we both suffer from multiple chronic conditions. I’ve talked about God, shown him tracts online etc. I see this question as another opportunity.

I could write volumes about what God has done, how I can feel joy and be thankful even though I’m not happy etc. But that doesn’t mean anything to him. I’m always there to listen (and he for me) and he seems open.

The first thing that comes to my mind is the first item in the Westminster Shorter Catechism:
Q. 1. What is the chief end of man?
A. Man’s chief end is to glorify God, and to enjoy him forever.
but I’m not sure how helpful that would be without elaboration.

What would you say?