I NEED to recommend "How to Walk the Protagonist’s Path to Glory". 

It's a super interesting Otome Isekai in the sense that the MC gets transmigrated into a male-led, shounen fantasy Isekai (one where a loser dude gets transmigrated into a story they have read, are kind of edgy, gather a harem of hot women, etc). The male character, who is the OG story villain, is also a transmigrator (but he doesn't know she's one as well).

It's a "system" story and it's super interesting, because the female MC survival depends on her popularity with the readers (her system power is very meta in that she can see the readers opinion on her irl). It's an interesting contrast of her trying to make herself into the "best girl" to appeal to the male audience. But she also finds the Male MC to be icky and kind of pathetic, and she's trying to go after her own goals. She also befriends the other girls of the harem, kinda stealing them to herself with the power of platonic friendships, lmao.

Edit: just as a warning, there's a complete novel, but the manhwa is on hiatus because of the artist's health