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Be sure to allow time at the end of the webinar for taking questions that your audience can submit throughout the webinar. The Q&A provides a great opportunity to engage your audience and give additional insight to what you have previously discussed, as well as related topics that are of interest to the audience.
It is really difficult to get an audience to be a part of your webinar. You always need to look for a topic from your niche that is trending to be able to capture the attention of a large audience. Do some research and look for customer problems. Be relevant and informative with your webinar topic to encourage more people to attend your webinar.