The problem is that FB has a large number of storylines and as the developer wrote in 2019 (on another site), the plan is that each storyline will get its own ending. I don't know if the developer's vision has changed over time or not, but either way, it's still a problem.
And yes, I really enjoyed
Luna's fall from Grace, you could say I was thrilled with this game, especially considering that I'm extremely picky about all games with female protagonists and that I like literally only a few of these games, which includes
Fashion Business and now also
Luna's fall from Grace. You're right, decisions do matter there and the game's finale can be very different from each other.
As for
Fashion Business, the only way I can see at the moment is to end most of the storylines like Julia, House , VIP Escorts, (e t.c) in the upcoming episode 4, leaving (for example) 3-4 main storylines for Fashion Business to follow.