 If you liked
Death March kara Hajimaru Isekai Kyousoukyoku
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 ...then you might like
Hyakuren no Haou to Seiyaku no Valkyria
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In both isekai's, the protagonist is able to use knowledge from the real world (Smartphone and internet in Valkyria and former game dev in Death March) in order to benefit themselves in the new world.
Both shows also consist of a massive harem, with new members getting added along the way through the 'heroics' of the MC
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Recommended by Short_Circut
Similarities:
-Same guy who found himself in another world.
-Same harem that gets added every episode.
-same fantasy, action , ecchi and magic
-Same luck that the guy always have.
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Recommended by JiangHaoyi1979