Translate broad feedback into observable behaviors. 'More structure' could mean weak issue trees, jumping into calculations, unclear transitions, or a recommendation that did not synthesize the case. 'Confidence' could mean voice, pace, hesitation, or simply not committing to an answer.
Recreate the interview while it is still fresh. Write down where you paused, where the interviewer redirected you, and which sections felt least controlled. Then have a strong case partner deliberately test those moments.
You are looking for repeated evidence, not one interpretation of two vague words. If three practice partners independently point to the same behavior, you have something concrete to fix.