Every athlete, every person goes through peaks and valleys in life, and mind blocks can be some of the most frustrating.
IMAGERY...this is something you do in all training at all levels and with any skill or routine and can be extended to school work or anything else in life. Close your eyes and see yourself performing the skill without error. When you can see that image in your mind open your eyes and perform the skill without hesitation. Caution though, always have someone there to give a safety spot just in case.
BACK TO BASICS...as the previous member mentioned, go back to basics and do the progressions that got you to the place you are now.
Remember, "you have nothing to fear but fear itself", you are S.T.B. (Simply The Best), you can do anything you put your mind to, Go For It, Just Do it.
Good Luck
Don