I believe those isekais where MC goes into administration or management are. I don't mean the ones where MC is like, "I want to open an orphanage, it just so happens that the bigger my orphanage is, the stronger I get"
Kinda like that Demon Lord story which taught us economics, or
Tanya the Evil, which while also was action, showed a lot of tactics in it's LN.
One book people reccomend me a lot is,
Prince wants to sell his kingdom, but that's just plain action with smart stuff happening off screen. You can enjoy it if you like Sherlock type novels,
Another is
Overlord, whose tactics are purely based on luck, hence to add some humor.
If you can handle dumb logic, like just pretend that everyone else other than MC is stupid,
Reincarnated as a genius is the closest one that's pure administration and smart work.
I actually have been planning to write a rom com using that, the MC is basically a mob character who watches a girl trying her best to confess to the boy she likes, however....I'm bad at romance