Keep people involved by following up with a personal message or discount code. Start by replacing the full-width header with a different color or a high-res image.
If you sell things, welcome new customers after a purchase, let lapsed customers know you miss them, or offer a deal to your best customers. If you've connected your store, try adding product or product recommendation blocks, too.
If you don't sell things, welcome new subscribers to your list, thank people for attending an event, and let inactive subscribers know you miss them.