It could be that you faced an overwhelming enemy or a situation that made it impossible to continue as the Demon Lord. Or maybe you just wanted a simpler, more peaceful life.
I'm not sure about the exact plot as I haven't read it in detail. But generally, it might be about a hero who decides to stop fulfilling the role of a hero, perhaps due to some disillusionment or personal reasons.
There were novels where the main character was a demon king, but these novels were relatively niche and many people might not be familiar with them. In novels, the demon king was usually a character with powerful magic and wisdom. He sometimes rebelled against human rule and tried to become the master of the universe. This type of novel often has elements of fantasy and adventure, and the plot is very attractive. For example," Devil's Day " was a novel about a demon king. It told the story of a demon king with magical wisdom and powerful magic power, Li Lingxiao, who experienced all kinds of difficulties and obstacles in the process of resisting human rule and finally won.
Since I haven't read the 'I Will Quit Being the Hero Novel', I can only guess. There would probably be the hero himself who wants to quit. There might also be some friends or comrades who try to persuade him to stay in his heroic role, or who are affected by his decision. And there could be some antagonists who either oppose him because he's a hero or who take advantage of his decision to quit.
To return it, the following methods are usually needed:
1. Gradually reduce the frequency of writing: If you have already started writing a novel and have a creative team, you can gradually reduce the frequency of writing and let the team monitor the progress and coordinate the work. He could also set a time limit to stop writing novels for a period of time so that his body and brain could rest.
2. Changing direction of writing: If you don't like the genre or it's outdated, you can consider changing direction. Try writing other types of books or movies or explore other interesting ideas.
3. Give up: If you have already written a certain number of novels and have a certain reputation, you can consider giving up. They could choose to leave the publishing industry and switch to other fields such as education, investment, or start-up.
4. Selling novel copyrights: If you don't want to write anymore, you can sell the novel copyrights to a third-party company for a certain amount of profit. However, this method needed to be carefully considered because selling the copyright required a certain amount of time and capital costs.
It should be noted that no matter which method you choose, you need to respect intellectual property rights and relevant laws and regulations to ensure that your actions are legal and compliant.
I can't provide a Marvel I'm the Great Demon novel because this type of novel usually doesn't belong to the Marvel Universe. The Marvel Universe was a superhero comic and movie series created by Marvel Comics, which covered many superheroes and villains, including Iron Man, Spiderman, Thor, Captain America, Black Widow, and so on. If you are interested in the Marvel Universe, I can provide you with more information.