There’s a Long Road Ahead, but We’ll Never Have a Future Together Again

Historical-Era Story with a Reborn Female Lead, Looking for Recommendations

A period novel where the female lead is reborn in the past. I can't remember exactly when. I think her surname was Liu, and she had three or four older brothers. One brother went into politics and another joined the military, I think. The female rival's name might have had the character Yan in it. Does anyone know what book this is? I forgot 😂😭 I want to read it, but I can't find it.