They have to go to AX. There is literally nothing else left for EN to push forward with at this point. Streaming income is going to continue plateauing/dropping because Niji has gotten itself on the wrong side of the Youtube algorithm, particularly with the ASMR window closing on them. Promotions/Sponsorships are down, and with Niji's public image in the West being the way it is, they may never recover. "Commerce," or rather merch sales, has been going down because of the 2% cut revelation, not the Selen stuff: Selen was just the nail in the coffin for that one.
I'd expect an immense push for NijiEN to be in every possible 3D event and concert Niji can wrangle them into moving forward. They can sell it to disgruntled fans, talents who felt they were being left by the wayside, and the investors (of course, Riku only cares about that last one).