I am unable to determine the origin of the Colossus you are referring to. If you can provide more information such as the title of the picture, the author or other context information, I will try my best to help you find the source.
There might be a male lead, like Jack, who is a brave adventurer in the world of 'a jaded blossom fanfiction'. He could be on a mission to protect the 'jaded blossom' from those who want to use it for evil purposes. He may have unique skills and a strong sense of justice.
The writing style might not be engaging enough. If the language was too dull or the descriptions were not vivid. For instance, if you just said 'He loved her' without showing how he loved her through his actions or emotions, it could lead to rejection.
The term 'colossus novel' is rather ambiguous. It could refer to a novel that is physically large, like an oversized or special edition. Or it could be a novel that has a colossal, or extremely significant, concept at its core. For example, it could be about a colossus - like figure in history or mythology, and the story could revolve around this figure's actions, their impact on the world around them, and the lessons that can be learned from their life. It could also be a novel that explores the idea of something being colossal in a more abstract sense, such as colossal love, colossal ambition, or colossal folly.