 If you liked
Youjo Senki
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 ...then you might like
How to Use a Returner
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Both Protagonists are antiheroes and have sociopathic traits, such as being extremely calculating & manipulative, as well as having little regard for others unless they are useful to them. Both Stories are isekais, although with differing settings (pure fantasy vs military&history fantasy). Both Protagonists seek to rise in the ranks and have an easy life. Another difference is that the protagonist of youjo senki is fairly overpowered, while the protagonist of Returner is quite weak, and mostly succeeds using manipulation, deception and lies (Though all of his recruited allies are overpowered in their own profession or skill).