"Wish happy returns" is a common greeting used to convey good wishes to someone on their birthday. However, there are many other synonyms you can use to make your message more unique and interesting. Some alternatives include "happy birthday," "enjoy your special day," "have a blast on your birthday," "may all your dreams come true," "best wishes on your birthday," "here's to another year of amazing adventures," and "may this year be filled with joy and happiness." No matter which phrase you choose, your loved one is sure to appreciate your thoughtful birthday message and feel loved and celebrated on their special day.