Breathing and relaxing exercises
Speaking about a topic of your choice at a distance and loudly in front of your friends or family but in public (park/ restaurant/ classroom)
Initiating conversations in a large group with familiar people.
There are more activities that will help your public fear
. However the practice of relaxing your facial muscles and body before representing in front of public is very important.
Kindly see a speech therapist
for detailed step by step guidance.