How To Live As A Writer In A Fantasy World

I would love to give this a better score but the somewhat interesting plot falls after some arcs around chapters 300 due to characters and author's way of handling said characters and their arcs.

The characters in majority are just bland, especially the MC and most of the heroines have absurdly shallow reasoning for even liking the MC with the exception of the best girl Marie who is much more charming than 95% of the characters involved and less shallow than all of them walking stereotypes. She is so good in fact that the author instead of progressing the story in an interesting way with her, decides to put her in the background so that the demon girl with 0 personality that is "oh so pitiful she deserves it" (not) thus forcing the story when it shouldn't at all. Also reinforcing my belief that black haired heroines are a menace who steal from better FMCs. Overall wasted a lot of potential