Hello! I've been searching for a long time for a bittersweet shoujo manga where the MC is bullied and the main love interest is the most popular guy in school who ends up taking an interest in her/falling in love with her and standing up for her. That or they're childhood friends and the main love interest became super handsome and popular and the girl gets bullied for being close to him. Bonus points if the story is about healing, or has a main focus on the bullying.

I've read:
Koko ni Iru Yo!
Hana Yori Dango
Akuma to Love Song
Watashi ni XX Shinasai!
Koe no Katachi

Any recommendations would really help!

Maybe these?

Say I love you (Suki tte Ii na yo.)
Honey lemon soda
Kimi ni todoke

These are all pretty long and i read them a while back (i think honey lemon soda is still ongoing). Hope this helps