It's a matter of personal preference. Some people might like it for its unique plot and characters. The story often has elements that can be engaging, like interesting power systems and character development.
Some novels that might be similar could be 'The Hunger Games'. At the start, Katniss volunteers for the Games (beginning), and then through her struggles and the revolution that follows, there is an end to the old regime. Also, 'A Tale of Two Cities' starts with the setting of two different cities in turmoil (beginning) and ends with a heroic sacrifice which is a kind of end. These novels, like 'the end after the beginning novel' (presumably), deal with the concept of change from an initial state to a final state.
Sure. 'Solo Leveling' has some similarities. It also has a main character with unique powers who grows stronger over time. And like 'the beginning after end novel', it has an exciting adventure aspect.
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.