To enhance remarketing efforts, you can target your audience according to their interest and demographics. It also helps get better rates of conversion by targeting the correct audience. It allows the host to create a list of leads and reach them at any time.
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.