About half of my professional life has been spent serving as a high school principal. One of the duties of that role is to plan and deploy the annual commencement ceremony for the graduating class.
I made it a habit to remind the graduates each year that they did not arrive at that important day all on their own. Each one had someone, or a bunch of someones, who supported them in achieving that milestone. Thus, I admonished the graduates to not let that special day pass without expressing their appreciation, thankfulness, love to those who meant so much to their success.
Oddly, the simplest expressions of gratitude and love often feel the weightiest. In fact, a simple hug, a heartfelt "Thanks," a sincere "I love you" seem supreme.
Graduation day is a great time for voicing such gratitude and love.
Thanksgiving is another excellent day for same.