Akuyaku Reijou ni Tensei shita Hazu ga, Shujinkou yori mo Dekiai sareteru Mitai desu

I have been reincarnated as Lydia, a character in the novel I finished reading. As the daughter of a noble family, she finds herself in a world where she knows the original story's events - but now she's determined to change her fate. Using her knowledge of what might come, she begins building new relationships with those around her, including her stern eldest brother Eric, her protective escort knight Ix, her caring second brother Kaiza, and her fiancé Prince Ruid. As she navigates this unfamiliar yet familiar world, she discovers that her actions are creating ripples of change in ways she never expected. Will her efforts to rewrite her story lead to the peaceful life she desires, or will new challenges arise from the path she's chosen? (Source: Hifumi Shobo, translated)