The plot of the book, A Guide to a Sweet Wife's Husband's Rebirth, is very similar to the novel described in the question. It might be the novel you're looking for. In the plot of this novel, the female protagonist, Shen Zhiyao, traveled back in time to become the evil ex-wife of the male protagonist, who struggled from the grassroots to become a big shot. In the beginning, she had proposed a divorce and wanted to leave the male lead. However, the male lead did not agree. Instead, he said that he wanted to keep her. Later, after the male protagonist became rich, the female protagonist also became rich and powerful. Just like the female protagonist who had become his dream lover, she had the male protagonist's heart. I hope you will like this novel.