 If you liked
Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta...
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 ...then you might like
Happily Ever Afterwards
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Both are manga about the female protagonist realizing they are a character from a fictional world. Both female protagonists make a huge effort to change their fate. In My Next Life as a Villainess, Catarina is trying to avoid dying through making friends and learning skills to protect herself. In Happily Ever Afterwards, Peony wants to marry Richt (her favourite character) however he lives in exile in a frozen inhospitable land and the character she reincarnated into is very sickly and hasn't been able to leave her home for most of her life.