What should I wish you?
我该祝你什么呢

I want to wish you all the best
想祝你平顺

but the long road is not always smooth.
可漫漫长路并非皆是坦途

I want to wish you happiness
想祝你快乐

but the future journey is not always joyful
但未来之途并非都是欢欣

Disappointment and low point are inevitable.
失意低谷在所难免

So I wish you to be brave and strong
那就祝你勇敢且坚强

optimistic and open-minded.
乐观且豁达吧