The whole silhouette strategy and "That man" being used again and again too. Just drop the info a bit more and flesh out the characters more into in depth complex characters like pre timeskip had.
I feel those strategies get exponentially lamer due to the fact we are 1,000 chapters in & however many years you've been following it. I'm not "tuning in next week, same Pirate Place, same Pirate Channel" because Oda made a silhouette of Kaido's hybrid form, I'm doing it because I enjoy the series and I want to read it all. I also doubt new readers are going "whaaaa!? My issue of Shonen Jump didn't show me what that dragon turned into, guess I better buy the issue 5 weeks from now when Oda returns to that group of characters and we see the reveal!!!111!!1".