Ill keep this short and sweet.
I am not 100% sure you do not do this already, but wouldnt you think about bulk emailing? Maybe a weekly newsletter?
Mailchimp is a good way of sending mail if you want to monitor who opened the emails...etc.
Your first 2,000 emails subscribers are free but you can change the subscriber list, in the past I just send to 2,000 each day, a different 2,000 per day. Out of 2,000 in my history approximately 20% open the email. But them 20% opening the email is better than no one hearing about RG and forgetting about it surely isnt it?
