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.
You can also market affiliate products during your webinar and earn money by each sale made during the webinar. During the webinar, a presenter speaks on the decided topic and can give the sales page of the affiliate at the end.
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Tips to make your webinar more successful