A drop in engagement, emphasis on advertising, a decrease in traffic to your site. You're not alone. A lot of marketers are seeing these changes.
But, frustratingly, many of the "Facebook Marketing" guides out there are from 2013 or 2014. Back when Facebook had barely a billion users and asking people to Like your page was still legal.
This resource, however, is as up-to-date as it can be. I'll give you 52 Facebook Marketing Ideas
52 excellent Facebook marketing ideas from Wishpond – count.'em. 9/10