There are different ways of getting likes to your page.
FACEBOOK PAID CAMPAIGNS:
Facebook has different type of paid ad campaigns. In order to get more likes you should combine these two:
- Traffic Campaign: the objective of this campaign is to send more traffic to your website. The ad contains the "like" icon and therefore your likes are going to automatically increase while users visit your website.
- Brand Awareness Campaign: The ad also contains the "like" icon and it's used specifically to get more like volume. (if user clicks on the ad, it is not re-directed to the website).
- Boost Posts: Boosting posts that had previously acquired good engagement on organic. If you know that organically have been doing good, then go ahead an boost them (paid).
FACEBOOK ICONS AND LINKS
Make sure that your website and blog has the Facebook icon. And in your emails and newsletters!
CAMPAIGN INIATIVES
New campaigns iniatives (to push on every channel): for example a give away or contest. Users are able to enter on a give away or contest if they provide their email and like your page (be careful and don't go crazy asking the user to do too many things as it has been proved that more than 2-3 things is way too much). There are some easy to use platform that help you creating these contests.

Hope this helps!