Any recs?

Greetings~ the isekai genre is becoming more and more repetitive sometimes I wonder why it's even an isekai like the character doesn't even use their past memories or act like their mental age. (COUGH. Hachi-nan tte, Sore wa Nai deshou. Damn middle-aged man acting like a 12 yr old.) I was wondering if yall had some Manga suggestions featuring the mc actually using their knowledge? especially if it's scientific. Something like honzuki no gekokujo (not science, but more like stuff for everyday convenience) , doctor elise (medical) or knight's and magic (programming). those are the only examples that currently come to mind jvjvdjfhf if there's gotta be magic in it, it would nice if they use their knowledge of chemistry or whatever to apply the magic more efficiently. Or so - I hope you get what I mean. When I say past knowledge I don't mean memories of playing an otome game, lol.