Sure, here goes:

Q: "What is the purpose of one's life?"

A: I do not know

Q: "What is the purpose of society?

A: I do not know

My central claim is that there is a purpose, not that I know what that purpose is.

I think understanding how something can be context dependent, but still objective is going to be important here.

I use the phrase "Context-dependant objective value" for a reason.

Objectivity ≠ Absolutism.

For something to be objective doesn't necessarily mean it's also absolute.