G'day Deloresh sorry for the late reply, if your clutch has got worse over a period of time then yours is prob on the way out, the biggest killer of any mech clutch that I see over here is not enough free play adjustment when you get down to 1/2" freeplay then it is time to adjust, you really should have about 3/4 - 1" of freeplay ( this varies from make to make ) but your op manual should tell you, so check your freeplay first you might be able to salvage some more time.
I have lost count of the amount of clutches I have seen that could have been saved due to a simple 10-15 min job as compared to several thousand $ to replace a clutch, of course not all clutch jobs are that expensive but some can be more.
As I said earlier if you have a bit of mech skills and the right tools then it is normally not a bad job you just have to be aware that everything is at least twice as heavy as a car.
Qalpa IIRC you have an inspection cover under your tractor bellhousing remove the 4 bolts and get a torch and look at the linkage operation as Gale said yours may be just stuck to the flywheel if the linkage looks alright then put it in top gear, drive around with your foot on the clutch and stomp on the brake pedals hopefully it may just unsieze if it does then slip the clutch a few (4 or 5) times to polish it all back up again. If it sitf for a long time with no use then it might be a good idea to block the clutch pedal down while not in use to prevent it happening again.
PLEASE BE CAREFUL if you are working on any clutch as the older ones contain ASBESTOS please treat ALL clutches as if they do as the fibres and dust can be fatal DO NOT blow the dust off with compressed air I like to use cheap cans of brake cleaner to wash the dust off and use a face mask.
Jon