Most athletes opt out before they reach goal. Getting better physically will help athlete become better. Confidence with competent is disillusion. Confidence is a choice. Base confidence on output from performance, not on medal.
Confidence is an independent experience.
Judges are not the problem. Race walking is probably the most technical event in tract and field. We know what skills need to be developed to become technically better. But competitors should ask themselves what they do daily, seasonally, or yearly to get better mentally. The importance of mental skills are known, so doesn't it make sense that a mental training should be developed just like a physical training plan.