Try these!
https://www.mangago.zone/read-manga/insecret_1/
https://www.mangago.zone/read-manga/lack_of_love/
https://www.mangago.zone/read-manga/monochrome_rumor/
https://www.mangago.zone/read-manga/off_stage/
https://www.mangago.zone/read-manga/switch_1/
https://www.mangago.zone/read-manga/prejudice/
https://www.mangago.zone/read-manga/they_are_a_couple/
https://www.mangago.zone/read-manga/once_again_idol/
https://www.mangago.zone/read-manga/in_this_life_the_greatest_star_in_the_universe/
https://www.mangago.zone/read-manga/my_second_life_as_an_idol/
https://www.mangago.zone/read-manga/debut_or_die/
https://www.mangago.zone/read-manga/the_genius_idol_s_strategy_to_stardom/
https://www.mangago.zone/read-manga/acting_genius_top_idol/
manga/the_second_life_of_an_all_rounder_idol/
https://www.mangago.zone/read-manga/i_became_the_youngest_top_idol/
https://www.mangago.zone/read-manga/princess_ai/
https://www.mangago.zone/read-manga/because_it_s_love/
https://www.mangago.zone/read-manga/holy_idol/
https://www.mangago.zone/read-manga/saving_the_doomed_idols_with_my_touch/
https://www.mangago.zone/read-manga/imitation_park_kyung_ran/
https://www.mangago.zone/read-manga/princess_ai/
https://www.mangago.zone/read-manga/so_i_married_an_anti_fan/
https://www.mangago.zone/read-manga/star_dream_idol_project/
BL
https://www.mangago.zone/read-manga/koi_ni_wa_mukanai_shokugyou/
https://www.mangago.zone/read-manga/in_my_closet/
https://www.mangago.zone/read-manga/whose_baby_is_it/
https://www.mangago.zone/read-manga/fanboy_and_robot_idol/
https://www.mangago.zone/read-manga/hyung_you_re_my_idol/
https://www.mangago.zone/read-manga/heat_x_beat_a_shut_in_omega_becomes_an_idol/
Someone recommend me a manhwa about idol