Anything

https://www.mangago.me/read-manga/omniscient_reader_s_viewpoint/
https://www.mangago.me/read-manga/our_not_so_lonely_planet_travel_guide/
https://www.mangago.me/read-manga/tadaima_okaeri/
https://www.mangago.me/read-manga/legend_of_the_northern_blade/
https://www.mangago.me/read-manga/the_boxer/
https://www.mangago.me/read-manga/the_world_after_the_fall/

Have you read the BEST new-gen DARK FANTASY, ACTION SHOUNEN MANGA of the 2020s, the peak of human literature, Kagurabachi? If you're looking for a story with a more slow-burning pacing and world-building, but masterfully-written plot, realistically written and interesting characters with great designs, GORGEOUS ART that evolves with each new chapter, MOVIE-LIKE fighting choreography, BEAUTIFUL panelling and composition and NO ROMANCE, ZERO FANSERVICE AND ABSOLUTELY NO SEXUALISATION, ESPECIALLY OF IT'S FEMALE CAST!! OH ALSO IMPORTANT MENTION; DON'T DROP THIS AT CHAPTER 58 (IYKYK), TRUST THE PROCESS OF HOKAZONO-SENSEI'S GENIUS!!  GO READ IT NOW!!!

https://www.mangago.me/read-manga/kagurabachi/ (PEAK FICTION)

Also these other shounen/seinen (mostly action, NO ROMANCE) mangas are great, too:
https://www.mangago.me/read-manga/gokurakugai/
https://www.mangago.me/read-manga/windbreaker/
https://www.mangago.me/read-manga/tokyo_aliens/
https://www.mangago.me/read-manga/gachiakuta/
https://www.mangago.me/read-manga/galaxias/
https://www.mangago.me/read-manga/ghost_fixers/
https://www.mangago.me/read-manga/centuria/
https://www.mangago.me/read-manga/psycho_eyes/
https://www.mangago.me/read-manga/witchriv/
https://www.mangago.me/read-manga/chainsaw_man/
https://www.mangago.me/read-manga/ultimate_exorcist_kiyoshi/
https://www.mangago.me/read-manga/madan_no_ichi/
https://www.mangago.me/read-manga/tongari_boushi_no_atelier/
https://www.mangago.me/read-manga/magical_girl_and_narco_wars/
https://www.mangago.me/read-manga/the_marshal_king/
https://www.mangago.me/read-manga/kai_hen_wizards/
https://www.mangago.me/read-manga/ruby_on_the_cake_hitogui_majo_no_bansankai/