Starting as an Island Lord

In a world devoid of potent magical power, how can one change the world?
Become a lord and cultivate the land!
In a world where without noble status, one cannot become a Grand Lord, what should one do?
Marry a Princess!
“I am the beloved husband of the Virland Princess, the loving father of the next Duke of Virland, and the contemporary guardian of Virland’s future destiny!”
“Now, I am the Duke of Virland!”
What?
There’s more than one Princess in the world?
Rosen Saxon, a transmigrator from Earth armed with a powerful AI system, has spent ten years diligently studying magic in Dawn City.
When his father, the Baron of White Sturgeon Island, dies unexpectedly, Rosen must return to claim his inheritance.
However, his barren and remote island, known primarily for its bird dropping fertilizer, is in turmoil. Faced with rebellious knights, hostile foreign powers, and constant threats from Forest Sprites and Sea Fishmen, Rosen must use his cunning, advanced magical knowledge, and unique abilities to secure his position as the new Baron.
A twist of fate leads him to marry Princess Serena, exiled from Dawn City, adding both a powerful ally and a dangerous target to his back.
As Rosen navigates the treacherous political landscape and builds his strength, he aims not only to survive but to transform his desolate island into a thriving power and carve his own destiny in a world on the brink of chaos.