Air in the lines usually gives a low engagement point, just like air in the brakes means the pedal will go closer to the floor.

A worn out disk (beyond the ability of the system to self-adjust) would give a high engagement point, then eventually it would'nt engage at all.

The push-rod that goes into the master cylinder can be adjusted for length. There's a lock-nut near the clevis that attaches to the pedal. Shorten the push rod to put the engagement point closer to the floor. But if the real reason is the clutch is worn out, this won't do any good.