Monetizing clickbait traffic

Popunders are no good because of the Facebook inapp browser not having tabs. Visitors leaving because they can't get back to the content wouldn't look good and would probably kill the link's reach.

Native Subscriptions from propeller and similar networks? They seem to be blocked by the Facebook browser completely.

Any ideas for monetizing these type of sites in 2019?

what kind of niche?

It's not clear what niche your site is and where your traffic from

What exactly are you aiming for?
driving traffic to your website from facebook with clickbait/viral posts?
and your not sure how to monetize your website?