Perhaps it's a tale that examines the impact of eternal life on relationships and the pursuit of meaning. It could also question whether immortality is truly a blessing or a curse.
Perhaps the story examines why some people have a desire to live forever and what drives that aspiration. It might also look at the challenges and isolation that could come with such a wish.
As a fan of online novels, I don't have any practical knowledge about the beautiful life of a woman who wears fast clothes. Fast wear was a type of novel or web novel in which the protagonist shuttled through different time and space to complete various missions and achieve goals in order to achieve redemption or revenge. If you want to know more about novels with the theme of fast wear, I suggest you consult relevant online materials or consult other relevant professionals.
The main themes in 'the villainess just wants to live in peace novel' are likely to be survival and peace. The character is in a situation where she has to find a way to survive in a world that might be hostile to her because of her 'villainess' label. Peace is what she desires, so it's a major theme. Additionally, there could be a theme of identity. She has to redefine who she is and show that she's not the typical villainess, which is also an important aspect of the story.
It could be a tale of power, ambition, and the fear of mortality. Maybe she seeks eternal life to protect her kingdom or fulfill some unfulfilled desires.
The villainess herself is surely one of the most interesting. Her determination to break away from the expected villainous path and seek peace makes her stand out. Maybe there's also a love interest who is interesting because he has to deal with her new - found goal of peace instead of the usual villainess behavior. And perhaps a sidekick or a friend character who helps her in her journey to live in peace.