Since debuting in 1997, One Piece has become one of the most popular media franchises in the entire world. The series is far-and-away the best-selling manga of all time, and thanks to its lovable protagonist, Monkey D. Luffy, the franchise continues to reach new fans each year, steadily elevating the hype surrounding its long-awaited conclusion.
Source:https://www.cbr.com/best-one-piece-arcs/