Once Wano finishes up, I can imagine Elbaf being a somewhat shorter arc like Zou was right before Whole Cake Island, which had more content going for it like Wano does now. If Elbaf is visited for just a quick bit (it was also shown for real in one of Big Mom's flashbacks a little before Whole Cake ended, but correct me if I'm wrong), I can see the next arc after that being Hachinosu, or Pirate Island, which is Blackbeard's main territory already. If it pans out like that, kinda knowing how Oda handles things, the next arcs I can see happening are Lodestar Island and Mary Geoise, whichever one comes first. Only then could I see stuff like Laugh Tale and the Final War taking place.
We've seen six fantastic locations after the timeskip anyway, so I can't imagine seeing fewer than four more now (counting Fish-Man Island, Wano would be the sixth). The pre-timeskip main adventure depicted ten of them as well, from Whiskey Peak to Sabaody, not counting the World Government's branches like Enies Lobby or Luffy's attempt at rescuing Ace.
We've seen six fantastic locations after the timeskip anyway, so I can't imagine seeing fewer than four more now (counting Fish-Man Island, Wano would be the sixth). The pre-timeskip main adventure depicted ten of them as well, from Whiskey Peak to Sabaody, not counting the World Government's branches like Enies Lobby or Luffy's attempt at rescuing Ace.