Based off on what you write, I’m thinking of some fairytale princess-like heroine that one day gets betrayed and then becomes a demon 

ahahah, that sounds like my type of story. Or maybe a solo leveling inspiration with yuri elements, I have an older story I dropped that I could pick up and base it on it

Ooh!

I have also thought of some Magical Girl story, but it didn’t seem much to be your type of story 

when I was younger I enjoyed that kind of stories but nowadays I don't lol, I would probably turn the magical girls into the villains and have the demons defeating them or something like that lol

I have plenty of free time, and I tend to stockpile chapters when I feel too lazy to release them. I also have some stories on hiatus, which I feel unsatisfied with, and intend to re-write them. I deas keep coming to my mind and I love turning them into stories ^^