Distribution & Syndication is the name of the game...Most aren't aware that when your content is shared & liked by those not following your page, you are then given the opportunity to manually invite them to your page.
If you can find a collection of niche groups within facebook & share the content that speaks directly to them- you can jumpstart the engagement that could lead to lots more engagement.

Of course there is a lot more ways to distribute-- but i've found this one the most effective.

If you have any questions or want to screenshare as i walk you through this-- lemme know! :D