I'm not sure as I haven't read it specifically. But generally, a 'regressor' in novel terms might imply a character who goes back in time or reverts to a previous state. So perhaps this novel is about a character who is not such a regressor and has a different kind of story, like a forward - moving adventure or a story based on present - day challenges.
The 'regressor instruction manual novel' could potentially be a story that delves into the concept of regression in a very detailed and structured way. The regressor might be a person who has the ability to go back in time, either physically or in a more metaphorical sense like undoing past mistakes. The instruction manual would then be a crucial part of the story, guiding the regressor through their journey. It could contain things like warnings about changing the past, or instructions on how to use their regression powers effectively. It might also introduce other elements such as antagonists who want to stop the regressor from following the manual, or allies who help them understand it better. There could be a whole world - building aspect around the idea of regression and how it affects the present and future in the story's universe.
I'm not entirely sure as there could be many different 'past life regressor' novels. Generally, it might be about a character who can regress to their past lives and experiences things over again, perhaps to correct mistakes or gain some sort of power or knowledge.
Well, first, build interesting characters with depth and growth. Also, pay attention to the pacing of the story. Don't rush or drag it out. Another key aspect is world-building - make the fictional world vivid and immersive.
Probably family restoration. Since it's about a regressor in a fallen family, trying to bring the family back to its former state would be a main theme.
The main character in the 'Regressor of the Fallen Family' novel is typically the one around whom the story revolves. They are likely to be the one with the regressor ability. This character probably has to face a lot of challenges related to the downfall of their family, like dealing with debts, family feuds, or loss of status, and uses their regressor power to try and turn things around.
I'm not entirely sure as I haven't read it in full. But generally, a 'past life regressor' type of light novel might be about a character who somehow regresses to their past life. It could involve things like using knowledge from the present life in the past life to change events, gain power, or solve mysteries.
In a 'past life regressor novel', the main character is, of course, the one who can regress to past lives. This character is usually on a quest of some sort. There could also be a love interest, someone who has a connection to the regressor's past and present lives. And then there might be an enemy, perhaps someone who fears what the regressor might change in the past that could affect the present or future. For example, in some novels, there could be a powerful wizard or a corrupt noble who wants to keep the status quo and thus tries to stop the regressor.