Authors who prefer debutante heroines

I haven't read this but it is sitting on my wish list. I don't know if it's exactly what you want but check it out.

The Loving Seasons by Laura Matthews

They were three young ladies just out of school, with good backgrounds and adequate dowries, ready for their first London Season.

But gentle Maggie’s blustering, autocratic father had a marriage in mind for her—to a man she’d never meet. Lady Anne, cherished daughter of an aristocratic family, could look to any level for a husband, but her choice fell elsewhere. Emma, niece of the notorious Lady Bradwell, was not one to hide her exotic beauty and flamboyant personality under a bushel—much to the irritation of a distinguished peer.

You may also want to check out Julia Quinn's books as if I remember correctly some of them are about debutantes.

I'd like to recommend to those who enjoy historical romance, book 3 of the Parish Orphans of Devon. I just left a review on Amazon and GoodReads, and think it's a 2020 top read for me. No steam by this writer, which is not my preference, but the writing is so evocative and beautiful, I absolutely believed in their love for each other.
A Convenient Fiction by Mimi Matthews