Tbh with Vegapunk forcing the crew to take him to Elbaph, this arc seems to be an important destination for Robin. Vegapunk and Robin are interested in the history of the void century. Saul’s alive too.
The beginning of the arc is usually where Luffy meets the next member. Loki is finallly revealed, after being mentioned a while ago. He makes Lola and BM pirates relevant.
Basically, Luffy met Loki because he was forced to go to Elbaph. Kuma is with them, which is the only clue we have about next nakama. However, I find it annoying how Luffy never said that he was looking for more members, not even seeming interested anymore.
It’s kind of too late, we seem to have been introduced to all the starring characters. If not too late, the good thing is that Vegapunk, and Loki makes the Bege/Lola(in Dressrosa), and Germa 66/Caesar(in WCI) cover stories relevant. Also the cover story about Miss Goldenweek (in Little Garden) is also. Maybe the locations in each of these cover stories is the clue.
