Once Raid is Over (Kaido/BM dealth with)
There will be an Arc (Mostly Short to Average), similar to Return To Sabaody, Punk Hazard & Zou Arcs that prepare for Bigger Major Arcs (Fishmen Island, Dressrosa & Wano in this example). This Arc will either be in a New Location or it's actually Act 4 of Wano (Which explains why Act 3 isn't over yet, cuz it represents entirety of Raid)
During this Arc, Straw Hats will have Fan-Favorite Fights (Especially Zoro & Sanji)
I have never seen someone predict this Upcoming Zoro's Fight before, even though there is Solid Argument for it