 If you liked
Eiyuuou, Bu wo Kiwameru Tame Tenseisu: Soshite, Sekai Saikyou no Minarai Kishi♀
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 ...then you might like
Neta Character Tensei toka Anmari da! the Comic
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Simiar vibe, both MC's are reincarnated as female characters and are eager to fight more powerful opponents.
In Neta, MC is reincarnated as a game avatar, while in Eiyuuou, a king reincarnates to master martial arts.
Both MC's get to fight an opponent 1-to-1 in terms of powers.