With such a large team and already active social media accounts, you need to be producing tons of content. For both your properties and for guest posting on other related sites. But you'll need to also promote your own content too. Try to write really edgy and engaging titles and articles.

Use paid social media to amplify your content and message. Use targeted Facebook ads to also grow your visibility.

If at all possible, try to come up with a unique story and angle that you can pitch to big publishers online to hopefully get more mainstream authority.

I've been in the online marketing world, successfully for the last 9+ years. I'd be happy to hop on a call and give you more details on these and other suggestions.