There are several synonyms that can be used to express the sentiment of "may you be very happy." Some examples include:
- May you find joy and contentment in all that you do.
- May your days be filled with love and laughter.
- Wishing you a lifetime of happiness and fulfillment.
- Here's to your happiness and well-being.
- May your heart overflow with happiness and positivity.
- Hoping all your dreams come true and bring you happiness.
- May happiness be your constant companion.
- Sending you warm wishes for a happy and fulfilling life.
- May every day bring a new reason to smile and be happy.
- May your life be blessed with joy, peace, and happiness.