I would give my friend two advices to help him overcome the difficulty of public speaking.
First, I would suggest practicing in front of family members. To be specific, simulating similar situations will help my friend be more confident in real situation. Moreover, my friend is more likely to feel less nervous when he makes speech next to families will not feel nervous when making speech to family. So he can practice in comfortable setting.
Second, I would suggest my friend to care less about making the speech perfect. To be specific, trying not to make any mistakes can give my friend lots of pressure so that the friend could be in trouble in the public speaking.
For these reasons, I would recommend these two tips to my friend.
이유들이 딱히 convincing하지 않고 문장에 개연성이 없어 보입니다
예를 들면 두번째 reason말하는 것고 그냥 less pressure하면 된다고 하면 되는데 너무 길게 끄는 것 같습니다.