Season 2 Barouque Works
Season 3 Skypea/EL
Season 4 TB/Summit War
Season 5 FI/ Dressrosa
Season 6 Yonko Saga
Season 7 Final War
At least one more season and it’s doable if we compress the story a bit
No way they can do that much and it wouldn't make sence in term of narration
Also remember that this show has 8 episode per season.
So we will most likely have:
S2: Entire Alabasta Arc
S3: Jaya Skypea
S4: Long Island Water Seven and Ennies Lobby
S5: Thriller Bark Sabaody
S6: The Summit War Saga.
Meaning that we would end on the Time skip..
As I'm looking here, there will be two major narration challenge, Skypea and THriller Bark.