You can add a C7, e.g.,

He will [C]help us every [C7]day,

As usual, it sounds better when played with Carter-style licks, hammer-ons and bass runs connecting the chords (there's a thread or two on this).

I often play it with the capo on 5 and the right hand closer to the bridge (especially when flat picking) for a tinnier sound. Helps to pick up the autoharp feel.