Confidence is competence refusing unnecessary theater.

When capability is real, the surrounding display becomes unnecessary and starts to look like padding. Theatrics tend to appear precisely where substance is thin, which is why they read as a warning sign to anyone paying attention. Stripping the performance away leaves either the work or the absence of it.

Look at how you present what you do and ask what could be removed without losing anything real. Remove it. What remains will be more convincing than what you took out.