It reads like you may need a new clutch system. First, check clutch pedal free play. This can be done by placing a ruler from the floorboard, w/carpet and floor mat, if you wish, next to the pedal. Place other hand onto pedal and note setting on ruler. Press down with clutch hand to till resistance is felt, note second ruler setting.
There should be no more than 3/8 inch of free play. If more, then adjust clutch at its adjustment. This being the linkage between the clutch fork and Z-bar.
Sometimes, in the life of a clutch, there will be no more adjustment left. This is a sign replacement is mandatory, or linkage may be bent or broken, or both.
Another test after free play, press onto clutch pedal, attempt to engage fourth gear. If it does not engage with relative ease, gear grinding, it can be assumed the flexible diaphram in the pressure plate may be broken. Hence, replacement is warrantied.
The last test is on the road. Watch speedo and tach, or listen to engine rumble. Place into fourth gear at, say 30 mph. Press on the gas pedal. Watch tach or listen to engine rumble, if engine speeds up and car does not move with engine rpm, its safe to say clutch system needs replacement.
If clutch has been slipping for a long time and driven this way, the engine flywheel will need to be removed, during the clutch system repair, and resurfaced at a machine shop. Depending upon amount removed, will determine if replacement of flywheel is warrantied.
Hope this helps........
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CUBS - 2016 World Series Champions - maybe this year, 2019 ...