The same way you would do so to anyone else.
These are common greetings from New Year, Christmas or Thanksgiving day. Examples Happy Christmas, Happy New Year or Merry Christmas. You could also say Happy Holidays.
In Ethiopia, the most common way to say "season's greetings" is "Melkam Gena" during Christmas, which translates to "Merry Christmas." For the New Year, which is celebrated on September 11 in the Ethiopian calendar, you can say "Melkam Addis Amet," meaning "Happy New Year." These phrases reflect the cultural importance of the holiday seasons in Ethiopia.
Sending out Christmas cards is far more common than sending out a New Year Greeting card. It is fair to say that many people send out Christmas greetings, and less people send New Year greetings. However, there are in-store and online resources for those who do choose to send New Year cards.
In Chad, common holiday greetings include "Barka da Sallah," which is used during Eid celebrations, meaning "Happy Eid." For Christmas, people may say "Joyeux Noël" to wish others a Merry Christmas. Additionally, during New Year's celebrations, greetings like "Bonne année" are exchanged to wish a Happy New Year. These greetings reflect the diverse cultural and religious practices in the country.
Mele Kalikimaka - Merry Christmas (translation of the english) Hau'oli Makahiki Hou = Happy New Year
Salaam, ndugu zangu.
Boas festas! (seasons greetings) Felicitações! (greetings)
Bonne Annee ! This means have a good new year, because that's what they celebrate. The french don't take that much notice of christmas, but if forced they say Joyeux Noel.
In Russian, you can say "здравствуйте" (Zdravstvuyte) or "привет" (Privet) to greet someone.
Greetings from Germany (English) Grüsse aus Deutschland (German)
In Hindi, "seasons greetings" is said as "ऋतु अभिनंदन".
Saudações