The Beginning After the End manga has indeed finished. It provided a satisfying conclusion to the characters' arcs and the overall narrative. Maybe there'll be spin-offs or related projects in the future, but for now, the main story is complete.
Douluo Continent Chapter 97 was the 97th chapter of the Douluo Continent novel series. It was not the beginning or the end of the entire book. There were a total of three novels in the Douluo Continent series: Douluo Continent, Douluo Continent II: Divine Soul Douluo, and Douluo Continent III: Legend of the Dragon King.
In 'beginning after the end', the protagonist has to deal with the fact that he is no longer in his former position of power. He starts from a relatively low point in this new life but gradually rises as he learns more about the world and his own abilities. The plot is filled with twists and turns as he battles against various foes and overcomes different obstacles on his path to regain some form of his former glory.
I'm not sure specifically as I haven't read it. But it might be a story about new beginnings that follow an end, perhaps in a fictional world with its own set of characters, conflicts and resolutions.