When your Traction is standing for long a long period of time you should cut a length of timber to depress the clutch petal and position to the steering wheel to keep the clutch depress until you use the car again.
To release the clutch plate, put the car in gear and start engine in gear, make sure your garage door is open and you have a clear area to get the brakes on if the the clutch fails to release. I would be very surprised if this fails to sort out your problem.
Regards, Davy
David Selfridge