Hold on to a few physical things from this year: a ticket, a receipt, a note. Future-you will want proof it happened.

Digital things are easy to keep and strangely weightless to come back to. A physical scrap works differently, because it carries the actual day with it, down to how the paper feels in your hand. Three or four of them a year is enough to make a whole period retrievable.

Start a box or an envelope this week and put one thing in it. Add to it when something good happens, and resist organising it.