Here’s how to engage the audience during your webinar:

Make the waiting time more pleasant
Greet the attendees. Mention that you’ll wait a minute for the other registrants to show up, or ask the attendees where they’re from, what industry they’re in, etc..

Start with introducing yourself in a relatable way
The attendees know you’re an expert (they wouldn’t register otherwise), so make sure to show them you’re approachable – so that they can ask questions, and relatable – so that they can empathise with you, which will result in higher engagement.