Can growth plates temporarily pause as in your height doesnt increase for a whole year but then reopens and you gain an significant amount of growth again (up to 5cm). can this happen and is it possible? especially to a 14 year old teenager?

Maybe/not. X-ray your wrist/hand to see if there are open growth plates in the long bones of your fingers. If these are open. the centers in your legs would be also & more height possible. If closed, they never re-open and growth has finished. No diet/supplement/exercise will add height after growth centers close. Not willing to get an x-ray and find the evidence? Can't help you.