Rec Isekai or anything

The only one I can think of
https://www.mangago.zone/read-manga/the_villainess_lives_twice/

My fiance is in love with my little sister.

https://www.mangago.zone/read-manga/the_monster_duchess_and_contract_princess/

https://www.mangago.zone/read-manga/i_don_t_love_you_anymore/

https://www.mangago.zone/read-manga/kill_the_villainess/

https://www.mangago.zone/read-manga/i_tamed_a_tyrant_and_ran_away/

https://www.mangago.zone/read-manga/under_the_oak_tree/

https://www.mangago.zone/read-manga/abandoned_wife_has_a_new_husband/

https://www.mangago.zone/read-manga/i_am_a_child_of_this_house/

Aww thankyou all (▰˘◡˘▰)

Regrets it later:
https://www.mangago.zone/read-manga/actually_i_was_the_real_one/
https://www.mangago.zone/read-manga/death_is_the_only_ending_for_the_villainess/
https://www.mangago.zone/read-manga/i_tamed_a_tyrant_and_ran_away/
https://www.mangago.zone/read-manga/i_m_not_a_villainess_just_because_i_can_control_darkness_doesn_t_mean_i_m_a_bad_person/
https://www.mangago.zone/read-manga/i_don_t_love_you_anymore/


https://www.mangago.zone/read-manga/the_emperor_reverses_time/ (the male lead mistreats his wife so he reverses time to make her happy now)

Still trying to kill her:
https://www.mangago.zone/read-manga/untouchable_lady/
https://www.mangago.zone/read-manga/it_s_no_use_hanging_on/
https://www.mangago.zone/read-manga/charming_and_the_beast/
https://www.mangago.zone/read-manga/the_sacrificial_princess/
https://www.mangago.zone/read-manga/the_duchess_with_an_empty_soul/
https://www.mangago.zone/read-manga/the_goal_is_to_become_a_gold_spoon_so_i_need_to_be_completely_invulnerable/
https://www.mangago.zone/read-manga/the_evil_cinderella_needs_a_villain/

*Not all are isekais, some mc's go back in time or stand up for themselves in the same life

WAAAATTT I- I LOVE U HAHAHAHA THANK YOU

Hehe glad to help out ^^