Ways to say 'Good luck':
1. Best of luck
E. g. Best of luck for your new venture!
2. Fingers crossed!
E. g. I hope you win the race Saturday. I'm keeping my fingers crossed for you.
3. Blow them away!
E. g. Good luck for today. You'll blow them away!
4. Break a leg!
E. g. "Break a leg!" shouted the stage manager to the heroine.
5. You'll do great!
E. g. Good luck with your interview. I know you will do great.
6. I hope things will turn out fine
E. g. Best wishes Jack, hope everything turns out fine.