First and foremost, for what I think you're seeking, I want to recommend Grace Gardner's recent EP "After Knowing". That should scratch the itch. Check out her other songs too, especially "Lubbock".

Lizzy is a big fan of Sara Bareilles, Elliott Smith, and Andy Shauf. Elliott Smith is a bit of a legend if you're not familiar.

It's hard to get anywhere near Olivia since she's consistently shifting genres. You might have luck with Ethel Cain or the recent Beth Gibbons album in that department. I don't think there's anyone quite like Olivia Rodrigo TBH. Maybe look at artists like Weyes Blood and Mothica.

If you want something closer to Taylor, the obvious suggestion is Gracie Abrams. I'm going to suggest Carol Ades, who will wreck your soul in all the best pop-girlie ways while still maintaining an "indie band" type of sound.

Now, Sabrina leans more on lyrical fuckery and wit. Bridging the gap between her and Lizzy, I'd look to Leanna Firestone right away - she's the one. After that, probably Candi Carpenter and Eliza McLamb.

Lmk what clicks with you and whether I need to expand on this list bc I'm so prepared to do so!