People in Japan say "Akemashite omedeto gozaimasu" to each other on the new year's day.
Almost impossible to translate into English, but I would say "Congratulations for the renewal."
Why do they say "congratulations" to you?
Because you are alive.
What is the renewal?
You are renewed together with the new year.
People who have lost their loved ones in the past year don't celebrate the new year, so there is no celebration to them.
If you can celebrate the new year, it means you were able to get renewed together with all your family members.
That is why it's time to celebrate.
What's to celebrate is your own life and the life of your loved ones.
If you are reading this blog, you must be alive! Congratulations! Happy New Year!!!