Well, I added some webtoons and tried to grab different genres. Nice to know people still appreciate the older stuff.
Dengeki Daisy (romcom)
Monster Child (action)
Dokgo (Action, similar to weak hero, lookism etc, but more mature vibes?)
Liar Game (if you like kakegurui, tomodachi game etc.)
One Outs (same mangaka as Liar game, sports theme)
Until Death Do Us Part (action)
Azure and Claude (short and depressing stuff)
Apocalypse no Toride (Zombies/horror)
Dragon Eye/Ryuugan (this was axed, reserialized, but no translations) Similar to Demon Slayer and Blue Exorcist. It's good if you enjoy those.
The Fable (a hitman doing clown shit)
Save Me by 1230 (manhwa/high school/bullying etc) You'll like if you enjoy weak hero type of plot.
An Uncomfortable Truth (manhwa/Read if you want depression, tragedy)
Watashi no Shounen by Takano Hitomi (familial bond? Lady and kid, no romance)
Sesame Salt and Pudding (cute couple/romcom)
Watashitachi no Shiawase na Jikan (trauma and healing/dark)
Three Days of Happiness (I don't remember, but it was sad)
Soloist of the Prison (familial bond, action)
Tetsugaku Letra (sports/same vibe as blue period)
Nekota no Koto ga Ki ni Natte Shikatanai (shoujo/kids)
Ohayou, Ibarahime (shoujo)
Nurarihyon no Mago (action/yokai stuff)
Koko wa Ima kara Rinri desu (deep topics about life)
Mystery to Iu nakare (Mystery,/mature vibe, funny dude)
Pandora Hearts (Fantasy/supernatural stuff)
Black Haze (manhwa/action, fantasy/it's getting a remake)
Aozora Yell and High school Debut (same mangaka, both romance and school life)
D.Gray Man (action/shounen, it's good )
Flawless (webtoon, romcom)
Unhinged (Manhwa, crazy people)
Inugami (action/supernatural, dog doing dog things)
Ogeha (insects, idk why it's labelled shoujo. I remember it being really messed up)
Iris Zero (like BNHA, mc has no powers, but is smart)
The Horizon (webtoon/war/depressing, kids)
Dogma (Manhwa/action, scifi)
Usemono Yado (josei/romance/sad stuff)
Adekan (I don't remember, but it has nice art and I think it was good? )
Blue Glass (historical, romance. Getting a remake)
Suiyou Kyoudai (siblings/wholesome stuff)
A Season of Dusk (shounen ai/soft fluff)
Rental Onii-chan (wholesome/sad)
At the End of 4 Minutes (oneshot/shinigami + girl)
rec me mangas from 2000s or 2010s