If you had a time machine and could send just one message to your past self, what would it say?

I am not interested in sending messages in my past. But I want to meet my childhood or school friends, teachers, neighbors, and many more to remember my childhood memories including picnics, gossips, and festivals. I want to meet my college friends, teachers, coaching friends, hostel mates, and many more to remember my memorable college life and fun.

I want to meet my colleagues in my first job to remember our trips, gossips, and many more in my past days. I want to remember my childhood memories, school days, college days, in trips, ceremonies, cultural programs, and many more by talking with my childhood friends, school friends, college friends, colleagues in first job.

I want to fun and enjoyment with my childhood or school or college friends, school or college teachers, in trips, dinner or lunch, watching movies, and many more activities in the present time.