This may or may not be discussed with children depending on their ability to tolerate self-evaluation. Keep your focus on solutions and don't dwell long on failures. Reframe a mistake as and effort for change, praising that effort. Identify ways to improve in the future. Lower your expectations and don't compare your child to others.
Many children avoid effort to avoid failure.
Of course if you don't try, you don't grow either. Set the standard for your child at the lowest level possible with the intent of raising it gradually over time. Lowering expectations doesn't mean you are letting your child get away with something or that they have won the manipulation game. You can then build from those successes. Read up on developmentally appropriate tasks and chores for children.