I suggest drastically cutting the budget for voice actors and using the money from there to fund more important parts of the game.
Now, I won't deny that voice acting does add a level of immersiveness, but I really don't need every single line in the game spoken. Maybe just for the first one or two lines to set the tone and character of the NPC talking and maybe full voice acting for major plot points, but not every single line please.
Use that money to create more gameplay options or roleplay opportunities or hire a very talented writer that respects the series.