Some good luck messages are "Those who are determined find success, and you are one such person," and "May you find as much joy in your life as you have luck, my sweet friend." Another one is "I'm always rooting for you, am your biggest fan, best luck to you."
Alternatively, to congratulate someone and wish them good luck in pursuit of a goal, tell them, "I don't see how there's any chance that someone like you can fail, but I'll say good luck to you, just in case you need a little." Also, "I am sending my prayers, good thoughts and a little luck toward you, just to let you know that I wish the best for you and what you are trying to accomplish."
Some good luck wishes come with inspirational messages. Examples of inspirational good luck messages are, "You are never too old to set a new goal for you or to dream a new dream, it is the way you see, good luck." Another one is that a person gets an opportunity to live once, therefore, if they live it freely and perform it properly, the chance is enough. After the inspiration, wish them good luck in their lives, and tell them to be strong and that you look forward to seeing them rise.