I think I'm starting to understand how to solve the color problem. To do this, I created a fake scene with the objects that I already have. Visually, it is very difficult to understand what is wrong and how to fix it, so I used a trick. As a character artist, I often use the Desaturate technique. In order to understand what is wrong with the colors, make them gray and look at the contrast between them. In this way, at least the contrast error can be corrected. At the moment, I do not take into account the effect of light on locations. If possible, I would like to make it diffuse, but still pixelated.
I understand perfectly well that I can’t customize every item for every possible situation, but I want to at least try to bring their color back to normal.