it's running out of content for new batches, and really shot themselves in the foot by doing double legend batches and making the movie batches into glorified TM boosters.
It's really not helped that Kaido's forces so far have been largely a bunch of jobbers.
Off the top of my head, they have these options left for new batches:
Maybe one more big mom pirates batch
Kinemon+ wano allies batch
Wano strawhats batch
Possibly a strawhat grandfleet batch
Wano hawkens batch?
and that really it unless they go back to earlier arcs (they won't)