To be honest the current state of the game is more like Episode 7 part 1 and the desert will be Episode 7 part 2 because the story was really short.
You're getting too used to the rushed global release schedule. Each episode took years to release, they were released in chapters and sometimes even only part of a chapter. Like Episode 6 had 6 chapters, and not every major update had new story. This is the slow trickle content that SEGA been doing for the past 9 years, I don't really see it changing much. It's fine if you don't like it or get burned out grinding, take a break - leave the game, come back if you want to when there's more new things or just find something else to play. I don't deny there's pretty limited thing to do right now in NGS, I'm starting to go back to PSO2, skipped TA/red container ranking last week but time to earn some pocket change SG again.