If it's cable or linkage it could be a leverage problem! The shorter the the throw (pedal movement) the more force required! This is also true for hydraulic clutches but may be easier to fix! If the pedal is to heavy swap to a smaller master cylinder piston diameter, if the throw is to long on not completely disengaging the clutch a larger diameter master cylinder piston my be required!
I modified my CR II cable pedal box to hydraulic. I don't recommend it, unless you like standing on you head! First I went to small then WAY to heavy! Getting the right throw and angle from the CR II clutch pedal lever to the master cylinder was a pain! If I had it to do over again I would by an after marked hydraulic pedal box!
No joke I tore the meniscuses in my left knee before I got it right! I'm in physical therapy now because I hurt it again working on a house!
https://www.jegs.com/i/Wilwood/950/340-11299K2/10002/-1
https://www.youtube.com/watch?v=2eUkT1HngW0