There are two things that set Slow Life in the Country apart from other Issekai manga, Pacing and Common Sense.
The manga is a slow slice of life manga, where while outside world events are introduced, they don't immediately take over the protagonists life because the author feels an obligigation to immidiately involve everything with the new element to the world. Adventurers are mentioned ,and slightly expanded upon, but the protagonist doesn't immediately join the Adventures guild upon finding out about them. He's a child, and in spite of his advanced mindset he is treated as such, being allowed to grow and train. Far beyond what his family and friends likley are aware of.
He also has a cheat power, basically up front. But unlike other OP protagonist with lost ancient powers, he doesn't lose all common sense and/or immediately reveal it by accident. He trains constantly as a matter of course, practicing and rapidly improving them, gradually revealing he is getting much stronger than what normal even for an adult much less a child. But other than being considered a prodigy, doesn't get caught in the scope of what he can really do, nor is his unique ability revealed.
The world is growing as he discovers it, similar to how a child actually grows up in a place. His ability to learn and understand is massively advanced due to reincarnation, but it doesn't happen all at once, and the manga has appropriate time skips to show advancement. I would not recommend it as a power fantasy, but it is a nice slice of life (If a bit overly focused on food) And it has a lot of potential as the author builds up his fantasy setting, which will hopefully branch out into a more active world as the protagonist grows into adulthood.
Written at Chapter 25