Same as in SEO.
You have to deal with the Off-page SEO techniques which help you to rank your Facebook page on Google.
Use quality content in our page to engage targeted audience.
Well, there's a lot of factors to rank on your page on Google.
Followers is just a bonus because I think it is more on user engagement, it is about how many users talk about your page inside and outside of facebook.
One way I would suggest is engage with people like influencers and other experts in your field and in your conversation use links to useful posts on internet and if possible back to your own site. this would enhance the presence of not just your facebook page but your site page as well.
Post unique content and images but relevant to the theme of your website.
Use hashtags in the form of keywords.
Do some Blog posts using the Facebook Page URL
These steps will increase the SEO of your Facebook page as well.