Ramp up your Outbound Sales Efforts (I.E call existing customers and have them renew or look at new products etc..Call those unreasonable prospects back and try to close that deal they said no to), its always a cure for declining sales, also throw a 10-20% discount or a free service or product with the purchase of something else to keep your offering fresh,stay away from devaluing your product too much with discounts...if you discount too much it may water down your products perceived value so it may be better to give something away for free with purchase etc...