If you have a good amount of traffic, I would like to know first how is that traffic finding your link on social media? Are you actively pushing your content through to them or are random people coming to your profiles and or posts? Are you boosting ads?
If you are boosting ads - your problem could be wrong target audiences and or wrong messaging plus wrong landing page ---> which leads you to having the wrong type of offer to the conversion.

If you are pushing the feed to random users yourself, you could be using the right words for them to be curious on social media but then they may realize that it wasn't what they thought it was.

Also, whether you have an app or not, is important to always think of SEO as a growth / user acquisition strategy effort which means that you or an agency (like Unthink) has to do its homework and create the right target for your content so that is organically found by them.

Once you having traffic coming in you can always A/B test everything so that you can see what's working and what is not.

If you are interested in further reading, check out this article:
Best SEO Practices To Increase User Base Naturally Through Google.
http://blog.unthink.me/seo-best-practices-to-growth-hack-startup-user-base

--- Unthink Digital Marketing is a full service subscription based marketing agency offering everything from simple websites to full developed apps and content marketing strategies through Hubspot. Visit www.Unthink.Me for more information.