你可以说 "I wish you happiness" 来表达你希望对方幸福的愿望。这是一句英式英语的常用说法。
英文例句：
I wish you happiness in your new job. (我祝你新工作幸福。)
May you find happiness in all that you do. (愿你在所有事情中都能找到幸福。)
如果你想用美式英语表达同样的意思，你可以说 "I hope you are happy" 或者 "I hope you will be happy"。
英文例句：
I hope you are happy in your new home. (我希望你在新家幸福。)
I hope you will be happy in your new job. (我希望你在新工作中幸福。)