If there is no fluid leak and the clutch master cylinder is full then it could be the clutch pressure plate. It is possible for a pivot point to break and cause the clutch to not release. This happened to me with my 1975 F 250 years ago. The pedal did not feel right when pressed and the clutch would not disengage. Had to drive to work at 5 am to stay out of traffic. Starting a truck in gear and shifting without a clutch is not pretty and I wanted to be the only one on the road. I hope its something easy for you to fix.
Allen
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