Send them invites for your webinars or whitepapers. Send an email regarding it, and wait for their response on it.
Twitter:

An on-demand presentation is a pre-recorded webinar which can be viewed by your audience any time they'd like. Unlike webinars, on-demand presentations do not require a large number of internal links.
When you remarket to your website visitors in your target audience, you can keep these prospects engaged with your brand and in your marketing funnel. Remarketing for webinars helps generate sales, whether it be online or offline.
? Conduct a live Q&A session:
? Create an informational landing page:
Tips to make your webinar more successful
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