I think they got more or less most of the conventional bases covered. This is how I see it
-Grassland/Forest (ep 1)
-Tundra (1st half ep 2)
-Dank Cavern (2nd half ep 2)
-Desert/Canyon (Ep 3)
-Ruins (last stages of ep 3)
-Jungle (ep 4)
-Beach/Pirates (some of Ep 4)
-Underwater Temple (last stages in ep 4)<--Yeah I agree with this
-Active Volcano (Jahillya raids)
-Town/Kindgom (ep 5)
-Lost Civilization/Floating Islands (ep 6)
-Graveyard (Pumpkin and ghost raid)
-Mechanical (Le Lua and Charlotte)
Yeah lots of themes belong to raids, and episodes have more than one theme (from what I believe), so if they do make ep 7, they gotta be
creative
bwahaha, gl with that ALLM...