Cairns are markers. They are signposts to record important information. They mark a burial spot, a place of ceremonial significance, and have been used in times of defense. In modern times they are used for hikers to find lost trails that have been covered with snow or overgrown. They take work to build and despite their strength and weight, they remain fragile, easily dismantled stone by stone.
Work on yourself. Take the time to mark where you’ve been and where you’re going. Take note of the causes of bad times, and commemorate the good.