My 30-year-old boyfriend sent me a WeChat and a mass New Year greeting. How should I reply?

You won't reply. Mass mailing generally does not arouse people's goodwill, and sometimes it even makes people feel insincere. You can take a sentence from somewhere and send it to people who are connected but not connected, people who have feelings and people who have no feelings, so that people can't understand your position in her mind. Therefore, in this case, you can not reply. You keep in touch with your boyfriend every day, and you don't need it to maintain your relationship.