How would you sing if you knew your audience was hearing choral music for the first time in their life?
How would you sing if you knew your audience was hearing choral music for the last time in their life?
I think in both cases, you would singing with passion, trying to use your whole being to express your love for the music and for the people hearing it.
Consider, then.
It’s likely that every performance you had ever given has contained a spectrum of listeners including people just forming their ideas and some people hearing this music for the last time.
Let every performance be expressed from your whole being.