For some plot twists. Try <Yuureitou>. Want some manga about genius protagonist? You could try <Usogui> or <Kurosagi> If you like resurrection type, try :

<Isekai Tensei Soudoki> <Nidoume no Jinsei wo Isekai de> <Mushoku Tensei: Isekai Ittara Honki Dasu> <Kouritsu Kuriya Madoushi>

If you're into some good art manga, try :

<Kokou no Hito> <Vagabond>

Like Manhwa? We got

<Xian Ni> <Tales of Demons and Gods> <Tower of God> <Noblesse> <Quan Zhi Gao Shou> A manga about OP gamer. <Gosu>

Or if you like some seinen manhwa

<Killer Stall> <Wake Up Deadman> A very good Manhwa.

There are also Manhwa with crazy good art but there are underrated such as <Fisheye Placebo>. If psychology is your thingy, you can try <Freesia>,<Oyasumi Punpun> or <Akagi>.

Like Entertainment/Arts/Music? Then we got

<Nodame Cantabile> <Piano No Mori> <Subaru> <Glass Mask>

For Historical,

<Basara> <Gamaran> <Historie> <Rurouni Kenshin>

If you like military settings, then I suggest

<Gunka no Baltzar> <Nejimaki Seirei Senki : Tenkyo no Alderamin>