I would go back to the start of the year and set them with the levels you have created and then send them a congratulatory email showing them where they are and welcoming them to your new tiering program.
This allows:
- 1.
to celebrate all that they have done
- 2.
shows them exactly where they are based on your levels and how easy it is to get to those levels (especially if you are resetting every year)
- 3.
allows for a fun campaign to make sure that they are still engaged and excited to be in your program!