I know a lot of people are talking about act 3 ending because of the number of chapters and stuff like that, but every act ends with something big happening and breaking the previous section of the arc and begins the next section, i just don't see anything like that happening right now.
First Act End we got Luffy being defeated and locked into Udon. Breaking the introduction section of the arc and going into a raid preparing section of the arc.
Second Act End we got Yasuie's death and the conclusion to all the preparation for the raid. Breaking the preparing section of the arc and going into the flashback / raid section of the arc.
Unless the Raid ends in failure in the next 3 chapters, i don't see how an act break would come right now, there's nothing big happening that could break the "raid" section of the arc and into another one, maybe if Onigashima lands in the Flower Capital and it changes from Raid Section to All out War at Wano Section or something.
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I'm still not even sure if we're getting more than 3 acts...