Here are some alternative ways to express the sentiment "may you always be happy": 1. Wishing you a lifetime of happiness. 2. May your life be filled with joy and contentment. 3. Here's to a future filled with happiness and good fortune. 4. May every day bring you happiness and fulfillment. 5. I hope you continue to find happiness in all aspects of your life. 6. Wishing you happiness that never ends. 7. May your life be blessed with eternal happiness. 8. May your heart be filled with joy and your mind with peace. 9. Here's to a lifetime of happiness and love. 10. Wishing you all the happiness in the world, now and forever.