Project Sekai Main Story is Ending 😭

After playing for 6 years, the day has finally come. Actually, they said it was halfway done at the 3rd anniversary, so it got extended a bit, but it seems like it will properly conclude. I've been playing Project Sekai because the story is interesting and I wanted to see it through to the end. Now that the end is in sight, I feel both happy and sad. Other games have done after-stories after the main story concluded, then shut down service while leaving an offline version. I wonder what will happen with Project Sekai?