The ‘limit’ is that which you place upon yourself. What one can conceive, they can achieve, and it is only the question of price (effort needed) to achieve it. Effort as will/intention x time. So, when one finds a pattern of doubt or their confidence lacks… one could instead reaffirm to the positive of that. Such that thoughts of failure are reaffirmed to be thoughts of success and learning. Confidence can come from a mountain of evidence; it can also just arrive as ordered by its actuator. One can feel however they want for absolutely zero reason, and all it takes is giving oneself the permission to do so. So, if confidence is needed to achieve a new height, then bestow it with grace, for it will soon be affirmed in that to which you do.

Meditate.

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