The best way to evaluate your topic is to conduct a live Q&A session. The audience gives their opinion about the topic you have selected and asks various related questions that will help you to create the perfect strategy for your webinar.
How to take advantage of remarketing of your webinar
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.