Here is a wonderful video about a teacher with another letter writing project now over 20 years old in Canada. See https://www.youtube.com/watch?v=oeX1H7ajOvQ
It shows the potential power of the letters our students are writing to themselves.
Volunteer School Time Capsule Postmasters help the letters to and by each student to follow those students year to year. Students build their plans in letters exchanged annually with parents and relatives over the 10 years from 3rd grade through graduation. Each parent and grandparent writes to their student about their dreams for them. They include stories from family history. Students respond writing to update their own life goals. Achievement soars!