Monuments are often erected in order to not forget, to immortalize something, such as the reminder of the horrors of war (for peace) or great leaders of the past.
The same could be true for every single mistake you have made. Immortalize that mistake in your mind, so that it never happens again. Embed that mistake in your memory for your own benefit, and for the improvement of yourself and your potential impact on your surroundings. You can do this by erecting a mental monument, or a conscious reminder, which will bring that mistake to mind whenever conditions are ripe for a potential repeat.
Daily Positive Focus 