I tried solving some old advent of code years at some point, and get the itch to do so every year that I take part in AoC, but it just doesn't motivate me when it's not... "live".
A couple days ago when I was discussing this on a discord someone said that one puzzle a week could work. Low-stress. And doing it in sync so that everyone (who's participating) does one puzzle a week, so we can discuss them, might keep the motivation up.
So I'm proposing that next Monday, 13th of February 2033, it's 1st of December, 2015: https://adventofcode.com/2015/day/1
Who's with me? No time pressure, day won't change for a week.