Send reminder mails to registrants in order to remind them of the webinar. It will allow them to schedule their work accordingly and would help you get the maximum number of people for your webinar.
Facebook:
When you have consistent attendance for your webinars, sponsored ads and announcements can help you make money by recruiting sponsors for webinars to help cover costs.

You can promote your webinar via social media. Post something related to your webinar continuously on social media, so your audience stays connected to your event.

Everything has been done, now you need to make an operative landing page to hold your prospects. Keep it simple, so more people can sign up for your webinar.
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