Thriller, Reality or Science Fiction (I really don't know :c) Book about a girl in a city divided into different social classes. She got send to the lowest class and attends a tournament to get up again.

[Snow]

Hi i am searching for a book i read a few months ago here is all istill remember: [I am spoilering a lot since i am saying what i remember]

I'm looking for a book about a girl who lives in a world with different social classes (gold, platinum, etc.). In a bet, her father loses everything and he "sacrifices" her, sending her to the lowest class (red...?). She is taken in by a childless family and has to participate in a deadly tournament to regain her place in the higher class. In the first competition, which involves swimming, she saves a boy's life and they later become allies. In another tournament, where she has joined a "clan," it's about a survival game in the desert. At the end of the book, there's a cliffhanger because it seems that the tournament is all fake and you wont actually get to a higher class.

Edit: I read the book in early 2024 or in 2023 and there a second part is coming/came out.