"Many happiness comes off the year"?
What I was trying to say in the sentence is - one is hoping/wishing that the new year will give happiness (hopefully). Is there any grammatical mistake in this sentence? Or just say "Many happy returns of the year"?

Question

Answer

I wish you much happiness in the new year

Do not use off

Answer

The usual way of saying it is "Happy new year", or "Merry Christmas and a happy new year".

"Many happy returns" is said to some one on their birthday.

If you want to put it into a sentence, then say "I hope you have a happy new year." or "May you have a happy new year."

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