There is a LOT of literary fiction centring queer women:
Milk Fed by Melissa Broder: mother daughter relationships, Jewish faith, relationships with food, body image and eating (bisexual)
Butter Honey Pig Bread by Francesca Ekwuyasi: Black womanhood, sisters, ogbanje and Igbo identity, trauma recovery, food and cooking as a love language (lesbian)
Kari by Amruta Patil: grief, loss, big city loneliness, musing on death, gender expression (lesbian)
Mostly Dead Things by Kristen Arnett: taxidermy, toxic masculinity, father daughter relationships, very fucked up queer desire, the dry, unromantic business of death (lesbian)
In At The Deep End by Kate Davies: sex, BDSM, kink pride, abusive relationships, gender identity, queer community (lesbian)
Paradise Rot by Jenny Hval: rotting fruit, cold days, speculative body horror, queer desire, gross sensory bodies (bisexual)
Honey Girl by Morgan Rogers: Black womanhood, queer found family, academic burnout, big city life, radio shows, navigating marriage (lesbian)
Girl Woman Other by Bernadine Evaristo: Black identity, gender, racism in 21st century England, intersectional feminism, generational trauma (lesbian, bisexual, various)
Everyone in This Room Will Someday Be Dead by Emily Austin: mental health, dark comedy, social anxiety, musing on death, Fleabag-esque church groups and religion (lesbian)
Notes of a Crocodile by Qiu Miaojin: Academia, 1980s Taiwanese identity, working class struggles, mental health, student lives, social alienation, gender (lesbian)
Roses in the Mouth of a Lion by Bushra Rehman: Muslim American identity, 80s music, coming of age, academia, sapphic awakening (lesbian)
Chlorine by Jade Song: violent girlhood, Asian diasporic identity, mermaids, competitive swimming, 90s music and cinema, body horror, sexual awakening (bisexual)
There is also a whole separate category for the genre that is "literary fiction centred around young queer women in academia falling for older women or for each other"
The Adult by Bronwyn Fischer (lesbian)
We Do What We Do in the Dark by Michelle Hart (lesbian)
My Education by Susan Choi (bisexual)
Sirens and Muses by Antonia Angress (bisexual)
And this is not even skimming the surface of translated fiction, or the enormous, rich, diverse canon of lesbian, bisexual and generally sapphic historical fiction by Feinberg, Sarah Waters, Eileen Myles etc. There is a lot of it. I recommend following more sapphic authors and bookstagrammers. Because only then will one be exposed to more diverse queer literature.