If I could teach every new speaker one skill, it would be the pause.
When we are nervous, silence feels dangerous. So we fill it: with "um", with "basically", with faster and faster speech. The audience gets a flood of words and very little meaning.
A pause does the opposite. It gives weight to what you just said. It lets people think. It signals confidence: only someone at ease can afford to be silent.
Try pausing in three places. After your opening line. Before an important point. After an important point, for a full two seconds, longer than feels comfortable.
It will feel like forever to you. To the audience, it feels like presence.