Fl was kinda useless now that I look back at the whole story

To be fair, she didn't have much time to develop. Since, everything was just pushed to her. If they let her know more about her power and her original world through stories, she would've had much more idea of what she should do. Like what her father said, a king only needs to be responsible of their decisions. In the end, she was able to completely grasp of everything and became a God of the world. Though, it seems like the story was rushed. So, that's why we couldn't see more about her character.