Hi Fabio,
the most natural step would be as most said to extend to other holidays, but you might also want to look at what makes your offer so successful at Xmas. Is it the variety of choice, how fast you deliver, how simple it is to order, your second to none customer service, your superior SEO? Once you identified that you can make it the core of your proposition and expand into other products (either same product different holidays or different products while keeping the same core proposition). Would love to see the website and talk on the phone to identify what is it that makes you unique and how to make your business a success all year long. Serena