1. https://www.mangago.zone/read-manga/i_m_a_villainess_but_i_became_a_mother/
2. https://www.mangago.zone/read-manga/the_beast_within/
3. https://www.mangago.zone/read-manga/sister_i_am_the_queen_in_this_life/
4. https://www.mangago.zone/read-manga/i_took_care_of_him_but_he_came_back_obsessed_with_me/
5. https://www.mangago.zone/read-manga/becoming_the_obsessive_male_lead_s_ex_wife/
6. https://www.mangago.zone/read-manga/the_heat_of_the_reincarnated_villainess/
7. https://www.mangago.zone/read-manga/i_became_the_villain_s_mother/
8. https://www.mangago.zone/read-manga/the_evil_witch_s_survival_plan/
(Number 1&6 truly disgusting and the worst)
You can choose then
Give me the WORST written reincarnation historical shoujo you've ever read, with the worst MLS, worst plot points and worst FL. "My body is possessed by someone" level of bad