The best way to do so is by extending the reach and lifecycle of the content and getting it in front of attendees and non-attendees, alike. This will give you a second chance to reach registrants who didnít attended the webinar for any reason. It helps create high quality content for your webinar and makes webinar replay effective.
As soon as a person register for your webinar, send them a thank you mail and a confirmation mail. Sending this is not only good manners, but will also help get a confirmation from the registrant side.
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.