Even the big updates may not help the game in the long term, if the new region ends up being the same as Aelio (with similar content, such as the story expansion, exploration areas with cocoons, towers, veteran bosses and gigantix bosses, battle areas and urgent quests), then with each update less and less players are going to return to the game. Big updates with more of the same followed by months of almost nothing in-between is not going to work.
I wish they would make more use of the data that is already available in the game (the Aelio region) to produce more varied content.
One option would be instanced dungeons. With the Nex Vera urgent quest and the story quests we can see that SEGA can use pieces of the available areas to create instanced dungeons, I think it would be nice to have dungeons for high level players based on the exploration areas, but including barriers to gate progression with goals such as defeat enemies or clear puzzles to progress, and with high level versions of the enemies and veteran/dread bosses from the exploration areas.
To make these worth doing, I guess they could be more reliable ways of getting augments that are only available from exploration areas? And I guess they could also have leaderboards and weekly rankings like the PSO2 time attack quests.
Other than that, side activities such as fishing, and I wish they would flesh out the world more, such as having NPCs outside of central city with additional side goals.
Basically, I wish the dev team would make more use of the available regions for more varied content between the big updates.