One Piece- 3d2y - Overcome Ace-s Death- Luffy-s... -

He says three words: “Let’s set sail.”

Batman uses his parents’ death to fuel vengeance. Luffy uses Ace’s death to fuel responsibility . He becomes less reckless, more strategic (e.g., using Gear 4th only when necessary, learning advanced haki to avoid touching toxic enemies). One Piece- 3D2Y - Overcome Ace-s Death- Luffy-s...

In the Sabaody Archipelago, after the two years, the Straw Hats reunite. No one asks where Luffy has been. They see the scar on his chest. They see the new confidence in his eyes. And they see the "3D2Y" tattoo that some of them (like Jinbe and Rayleigh) literally have on their bodies as a mark of loyalty. He says three words: “Let’s set sail

One Piece- 3D2Y - Overcome Ace-s Death- Luffy-s... In the Sabaody Archipelago, after the two years,

Luffy’s realization that grieving forever would insult Ace’s sacrifice. Ace died to protect Luffy. If Luffy dies of grief, Ace’s death becomes meaningless.

Ace’s death became the foundation of Luffy’s New World mentality. Look at every major decision post-timeskip:

The peace of Luffy’s training is shattered by the emergence of Byrnndi World , known as the "World Destroyer". One Piece Wiki