Changing this is a precision job. In an ordinary day there are only a few moments where how you come across undersells what you bring. You adjust those, and leave the rest alone.
Before you speakTake a beat before you start. Settle your posture, claim your space. You already know your point; the beat is for everything around it.
In your opening sentenceRemove all hedging from your first sentence, drop the apology frame. "I want to raise something" instead of "I hope this isn't a stupid question." "I see it differently" instead of "I could be wrong, but".
When challengedPause before you answer. The reflex is to rush in and soften. The pause comes across as someone weighing a point rather than someone caught off guard. Then hold it or revise it cleanly, without taking it back.
With your workput your name on it. "That builds on the approach I outlined last week" keeps the credit pointing at you.
These are small adjustments. People register them as large ones.