Look at the trophies, ribbons and certificates you kept versus the ones you tossed. Your shelf already ranked what mattered.

You made those decisions one at a time, without thinking of them as decisions. A ribbon went in a drawer because it meant something, another went out because it did not, and nobody asked you to explain either move. The result is a ranking you never consciously wrote. It tends to be more honest than the answer you would give out loud.

Go look. Pick up the one you kept for the least obvious reason and ask what that day was actually about. If something you supposedly care about is not up there anywhere, that is worth a minute of thought too.