Check the fluid in the brake master cylinder. Look at it very closely as there is a hard to see divider/wall that makes it difficult to see the rear section fluid level.

Look for leaks above the clutch pedal (clutch master cylinder) and on the side of the transmission (clutch slave cylinder).

It could also be a worn thru clutch fork at the pivot ball.

My guess is it is time for a new clutch slave and clutch master cylinder, the cloth hose between the brake master cylinder and the clutch master cylinder and the line between the clutch master and the slave cylinder. This would be an overhaul of the hydraulic clutch application system; but, look for leaks first and a worn clutch fork.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer