The first thing is to make sure that the mechanical part of the clutch is fine. To do this, it is enough to lift a rear wheel, gear a speed and keep the clutch pedal tread.
If rare noises are not heard and the wheel that remains raised does not rotate, the disc set, clutch collar maza works more or less well (eye, this does not mean that it is not worn or partially grated).
After making sure that at least the mace and clutch collar are fine, we will pass to the hydraulic part.
First you will have to bleed the circuit as it says they play them and make sure that it does not pull liquid anywhere.
If it continues to stay down, and the pump is new, or you have air or the sewers of the hype or the pump let the liquid pass from one side to the other of the piston.
All the best.