* The Legend of Korra: This is a sequel series that takes place 70 years after Aang defeats Fire Lord Ozai. It follows Korra, the next Avatar, as she deals with new threats and challenges.
* Comics & Novels: There are numerous comics and novels that expand on the world of Avatar, exploring the lives of characters like Zuko, Sokka, and Toph, as well as diving into new storylines.
* The Last Airbender Movie: Although not considered canon by fans, there was a live-action movie released in 2010. It's a different interpretation of the story, but it does continue the events after Aang defeats Fire Lord Ozai.
So, while the animated series itself ends with Aang's victory, the story of Avatar continues in other forms.
It's worth noting that most fans consider The Legend of Korra to be the true continuation of the Avatar story, and it's definitely worth watching if you enjoyed the original series.