You probably already know this but here's the holy trinity.
https://www.mangago.zone/read-manga/omniscient_reader_s_viewpoint/
https://www.mangago.zone/read-manga/trash_of_the_count_s_family/
https://www.mangago.zone/read-manga/the_s_classes_that_i_raised/
Also a few others I like:
SHOUNEN
https://www.mangago.zone/read-manga/how_to_live_as_a_bootleg_healer/
https://www.mangago.zone/read-manga/underworld_restaurant/
https://www.mangago.zone/read-manga/i_got_lucky_and_pulled_a_10th_rank_summon/
https://www.mangago.zone/read-manga/pick_me_up/
SHOUJO
https://www.mangago.zone/read-manga/death_is_the_only_ending_for_the_villainess/
https://www.mangago.zone/read-manga/housekeeper_in_a_dungeon/
https://www.mangago.zone/read-manga/i_became_the_despised_granddaughter_of_the_powerful_martial_arts_family/
https://www.mangago.zone/read-manga/tearmoon_empire_story/
The literally best mangas or manhwas ever any genre