Akagami no Shanks is a captain of the Akagami Pirates and the most respected Yonkou by all his followers. He is a man of mystery and has inspired Luffy to become a pirate since childhood. Shanks had also saved sea monsters when he was a child by sacrificing his own arm. He is a reliable Haki user and is also skilled with the sword, which is why he has a sword called the Griffon and he often carries it with him wherever Shanks goes.
Shanks is a former member of the Roger Pirates. Since childhood, he and Buggy have followed Roger and his group across the ocean. That's why he learned a lot from Roger and chose to become a pirate like his late captain. Therefore he has grown strong since childhood until now. Although Shanks' life journey is quite long, he is not a Devil Fruit user like Whitebeard, Marco and others. Even though Shanks is a Gomu Gomu no Mi fruit thief and has the opportunity to have the Devil Fruit power.
It seems that Shanks has a pretty good reason why he doesn't want Devil Fruit powers, it could be because he wants to be like Roger. The former Captain Shanks is also a Haki user and proficient in using swords, even Roger's sword is said to be one of the strongest swords named Ace. That's why Shanks also imitated Roger's pirate path, which was to only use Haki and a sword as a source of power that he had.
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Besides that it seems Shanks doesn't want to lose his swimming ability for some special reason. It is possible that because Shanks has a high helping spirit, he is worried if he is forced to swim to help others at sea. Although he does not have a Devil Fruit, Shanks is also known to have extraordinary strength and is feared by some of his opponents. So it seems that he is satisfied with the power he has now.
Shanks is also known to be wise and not greedy, as it is proven that he did not immediately eat the Gomu gomu no Mi Devil Fruit after successfully stealing it from the World Government. He chose to save it first and was accidentally eaten by Luffy. Because of his wise attitude, maybe Shanks chose not to be greedy in terms of strength and prefer to deepen the strength that he currently has.
Even though Shanks idolizes Roger, he doesn't seem to have the ambition towards One Piece like Luffy and the other Yonkou. This is also a mystery, because in the past he did not accompany Roger to Laugh Tale and preferred to accompany the sick Buggy on a nearby island. So that only Roger's attitude is not imitated by Shanks, he seems to have his own pirate path which is still a mystery.
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Shanks' power is seen several times in the One Piece series. Namely when he repelled the sea monsters that attacked Luffy using Haki, and when he used Haki when visiting the late Whitebeard on the Whitebeard Pirates' Fleet ship. In fact, he also showed his authority when stopping the Great War at Marineford, at that time the Marines such as Akainu, Sengoku and others immediately obeyed Shanks' orders and stopped the great war. Without a Devil Fruit, Shanks has become one of the most authoritative and powerful pirates.