If you're fine with GL, then:
https://www.mangago.zone/read-manga/goukaku_no_tame_no_yasashii_sankaku_kankei_nyuumon/
https://www.mangago.zone/read-manga/there_s_weird_voices_coming_from_the_room_next_door/
https://www.mangago.zone/read-manga/luminous_blue/
https://www.mangago.zone/read-manga/watashi_no_shumi_tte_hen_desu_ka/
https://www.mangago.zone/read-manga/beast_knights/
https://www.mangago.zone/read-manga/shoujo_sect/
https://www.mangago.zone/read-manga/i_wanna_die_before_i_m_30/ if you haven't, but it's quite popular so you might've; but TW for drug abuse mention because one of the character's is an ex-addict.
Recommend some poly relationships mangas and manhwas please :3