I launched Mimic, a simple social app that let's you challenge people to copy you. How to get initia

I've been using many social apps throughout the years from snapchat, instagram, TBH, Sarahah, YikYak... So I decided to make one of my own that (I think) hasn't been created so far.

It's pretty simple, you post your own photo/video and other people can copy what you posted or you can browser around and try to copy other people. Internet challenges such as ice bucket challenge, cinnamon challenge, Kylie Jenner lip challenge were my inspiration for this app.

What would be the best way to promote such app?