Best way to Launch a new app and gain traction

Looking for suggestions on the best approach to launch the allgram app. I've received plenty of suggestions from marketing and branding companies and would like to get your input on the most effective approach. You can learn more about allgram @ www.allgram.com or @ https://play.google.com/store/apps/details?id=com.app.allgram Thank you all in advance for your participation.