If you liked
Eiyuuou, Bu wo Kiwameru Tame Tenseisu: Soshite, Sekai Saikyou no Minarai Kishi♀
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...then you might like
Saikyou no Ousama, Nidome no Jinsei wa Nani wo Suru?
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Both MC were kings that dies and reincarnates as a baby. Using knowledge from their past life, they quickly develop their power and will become OP.