The drawback of making the machine more quiet is that your stepper motor will lose torque(stepper noise reduction/smoothing usually works by reducing step size from full steps between the coils to moving between the stepper coils). The steppers are fairly small and when building large parts, they sometimes miss steps already… So reducing torque is not a good option.
There is also more to noise reduction than just replacing the stepper motor drivers/step size. The thin walls and lightweight structure and hollows inside the machine are a perfect resonance box. So while you could try to minimize it, the noise will still be amplified…
It would be the easiest to just build an isolation box around it with sound insulation matts and check the temperature reading on the display to be sure it’s getting too warm.