Hi there!
To build upon the first response, we definitely agree that your product / service is highly niche. Assuming you and the client have a solid understanding of your target audience, use Facebook's precise targeting to your advantage. You can get incredibly granular with who you target - interest based, behavior based, people who like other pages, and several different types of retargeting including email list uploads and website tracking. Since your page has a very small amount of likes to begin with, it would be best to try and grow your audience through "like" campaigns to a hyper specific audience that will appreciate and interact with your page content.
Additionally, we would recommend changing the format of your organic posts. There is obviously a bit of a learning curve with your products / services, so maybe try posting informational but interesting videos or blog articles that demonstrate how to use the products or the benefits of using them. Testimonials from users or other user generated content could work here as well. Test different formats to see what gains traction. From there, you could start dedicating more budget towards promoted posts or other campaign types.
We also noticed that the page itself isn't incredibly informative. Fill out the fields on the "about us" page to give your site more credit and authority. And, perhaps something more descriptive than "a site dedicated to the study of everything" - since that doesn't really tell users anything.
Finally, do you have any competitors? Identify your primary competition on the web and see what they are doing via social media and in general with their internet marketing efforts. This might give you some ideas on what works / doesn't work and could provide some insight into what the market is looking for.
Hope this helps!