Similar to "Spotify Wrapped" or Goodreads "Year in Books" - an automated email to users that shares their individual stats (Congratulations, you donated $225 to 3 nonprofits and volunteered 22 hours! You spent most of your time supporting the Pleasantville Food Bank...") This could be a way to remind donors of what they did throughout the year, or even better, there could be a shareable component for them to upload a graphic on their internal company social media.

Additionally, if this was sent in January, there could be a reminder of how/where to access end of year BBGF receipts for tax-reporting.