Speak about your mistakes often, particularly if you are in a position of power. Tell about what went wrong and what you did learn. Anticipate how the next time will be.
It’s also a great way to assess people around you and the environment you are in. If you recently joined a company, and nobody talks about mistakes ever, particularly when everyone is listening, that is not a company that knows how to learn and promote innovation.
Mistakes are essential. Promote them to become better.