 If you liked
Death March kara Hajimaru Isekai Kyousoukyoku
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 ...then you might like
Tate no Yuusha no Nariagari
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Isekai medieval fantasies, that focus a lot more on the actual RPG elements (HP, MP, Skills, etc...) rather than casually ignoring them. Both also feature harems forming due to the MC's heroic efforts
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Recommended by Short_Circut
They have the same storyline theme isekai, not only that both of these series have in common that the main characters are called not by a trivial reason they are called to another world to get things done (being heroes), they also take the storyline in the kingdom where slavery is a natural thing.
both Mc are overpowered and they are really kind to slaves and half humans
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Recommended by RobinXButcher