Passing knowledge forward is one way of making your mistakes useful to strangers.

Mistakes are expensive and mostly private, and the cost sits with you unless something is done with it. Telling people what went wrong converts the expense into something useful for strangers who will never know your name. That is one of the few genuine returns available on a bad decision.

Pick one failure you have not talked about because it was embarrassing. Say the useful part of it somewhere it can be heard. The embarrassment is usually the most instructive detail.