https://www.mangago.zone/read-manga/wish_you_all_the_best/ this has the craziest redemption shit, i never thought id ever recommend someone this but its grown dear to me now and the plot doesnt feel like its dragging
Have you tried "A room without a window"?
I will always recommend this, its so soo good, with a very nice plottwist in the first chapters!
https://www.mangago.zone/read-manga/a_room_without_space_side_story_1/
And the other work of the same artist "Boss Bitch Baby" is also very very good, I'm currently re reading it, and the story and little angst in there are delicious. ALSO very peak AU side stories!
https://www.mangago.zone/read-manga/boss_bitch_baby/
Dam of the forest
anything with heavy angst but still has it’s fluffy moments with a happy ending even bittersweet works also