are you up for some watching? Death Parade is an anime original so there's no manga but such a good series w/c fits your description to a T. but something like https://www.mangago.me/read-manga/sankaku_mado_no_sotogawa_wa_yoru/ might be something you'd be interested in reading.
Personally find this manga interesting bc it questions life choices, vices... https://www.mangago.me/read-manga/fushigi_na_shounen/
seeing ppl for what they are: https://www.mangago.me/read-manga/homunculus/
Based on rl : https://www.mangago.me/read-manga/yomawari_sensei/
Interesting perspectives from mc: https://www.mangago.me/read-manga/mystery_to_iunakare/
Reading about the characters makes u say this is so real: https://www.mangago.me/read-manga/nietzsche_sensei_konbini_ni_satori_sedai_no_shinjin_ga_maiorita/
Another take on vices and virtues: https://www.mangago.me/read-manga/koko_wa_ima_kara_rinri_desu/
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https://www.mangago.me/read-manga/dr_brain/
https://www.mangago.me/read-manga/shiyakusho/
I can't find a better way of saying it, but like these stories that make you question everything in your life, and when they end, you just feel like not doing anything, feeling empty seeing the world differently ?
I know I've got this feeling after reading some stories like :
- the ending of the novel omniscient reader's pov
- Banana fish (to be fair this one made me more depressed than inspired)
- Sweet Home
- Pandora Hearts
- Life Senjou no Bokura
I just want to read another story that makes me feel this way !
Any genre is okay