Offer an add-on service or upsell

Appeal to your existing fan base and loyal customers as they are your best and most reliable source of revenue—after all, they already LOVE you and are using one of your services. Offer an add-on service or upsell to a product they may already be investing in. Something that they can answer «Yes» or «No» to quickly (hopefully yes) over the phone or via email so that you can take action on it right away instead of having to deal with a lengthy sales call or having to schedule a time to discuss the service.