there're some blackhat method to do this, but i don't wanna mention about it. you could try to make your content good, and buy some ads. That's the way!
Set goals
Improve your Page
Increase the visibility of your Page
Create better content
Be responsive and human
Plan monthly campaigns
Use Facebook Ads
Use analytics to your advantage.
You should always be active on Facebook and keep posting regularly. Engage more and more. optimize your FB page. see whether the followers are liking your content or not. create unique and original content. use trending hashtags and relevant hashtags.