I recommend One Piece: The Low Profile King to you. The protagonist, Lin Nan, accidentally transmigrated into the world of pirates and became the heir of the Reth Kingdom, Reth. Grimm. Lin Nan, who had modern consciousness, wanted to return to his own world, but only by becoming the king of that world could he achieve it. In the world where pirates were rampant, Lin Nan bravely moved forward and used his eyes to see through the world to survive. In the end, he became the king and had the chance to return to his own world. I hope you like my recommendation.😗