Here's what happens after the climax:
* The Aftermath: The Capitol, stunned and enraged by Katniss's defiance, tries to control the narrative by presenting the double victory as a romantic gesture. They attempt to paint Katniss and Peeta as "star-crossed lovers," playing up their "love story" to distract from the rebellion that is starting to stir.
* The Seeds of Rebellion: Katniss and Peeta, despite being victorious, are both deeply traumatized. They know the Games have changed them, and the Capitol's manipulation only fuels their resentment. The Games have become a symbol of oppression, and their actions have sparked a flame of defiance in the districts.
* The Mockingjay Symbol: The image of Katniss and Peeta threatening to eat the berries becomes a symbol of defiance, quickly spreading throughout the districts. The mockingjay pin, which Katniss wore throughout the Games, becomes an emblem of rebellion.
* The Growing Rebellion: The districts begin to organize and fight back against the Capitol, using the mockingjay as their symbol. Katniss finds herself thrust into the role of a symbol of hope for the rebellion, despite her reluctance.
* The Start of the War: The Capitol, realizing the extent of the rebellion, prepares for war. They begin sending Peacekeepers to crush any signs of resistance. The Districts, now more organized and prepared, fight back.
The events after the climax of *The Hunger Games* set the stage for the rest of the trilogy, where the fight for freedom becomes the central conflict. Katniss and Peeta, caught in the middle, become the faces of the rebellion and must fight for survival while trying to navigate the political machinations of the Capitol and the districts.