Manhua-esque plots (though I think I might be playing fast and loose with that term):
A villain(ess) is reincarnated as a child with the memories of their past life still intact. Time has passed and by now their name is nothing more than a few pages in a history book. But this second chance gives them an opportunity to either recover their power and rise in a world devoid of the hero (or heroes) that slew them and regain their former glory or possibly live a new life entirely (though it doesn't have to be a peaceful one.)
The House of Valmont stands proudly at the right hand of the king, a relationship that can be traced all the way back to the founding of the kingdom and has stood strong for generations. It is only natural then, that the heir of each house be made to spend time with one another from a young age and continue throughout the course of their lives. (This could honestly go several ways from rivals to lovers, enemies to friends, competition to the death, etc.)
A noble is killed by their child, the cold look of disdain on their face is the last thing they see before all does dark. Slowly, they wake up to a bright new day. Time has moved backwards for an unknown reason, but a second chance is a second chance. There is time to repair what was damaged by years of neglect, time to be a father for once and not just the House’s head. (could potentially be spun into an isekei-type plot instead as well.)