What Do I Do After Reincarnating as the Villain Su She?

OOC warning: much of this story is based on my own headcanon. No breaking up the canon couples, no breaking up the canon couples, no breaking up the canon couples!!! I said it three times because it matters. Xianxian is my precious boy. Seeing him happy makes me happy. Since you have accepted my gift, you must bear its consequences. After Su An died, the Heavenly Dao came to his rescue. He was reborn in Su She’s body. He thought the Heavenly Dao pitied him and had given him a chance to start over. But no matter how hard he tried, his cultivation improved too slowly. Ever since he began his journey to immortality, his body had grown increasingly frail. One day, by a twist of fate, Su An finished reading this book, a lost, one-of-a-kind text from a lesser world. That was when he learned he had transmigrated into a book, into the body of a villainous cannon-fodder character. After realizing he couldn’t protect the people he cared about, Su An refused to accept his fate and began to fight back against the Heavenly Dao.