I launched beta version. What's next?

I have created a beta version of my side project - Art Swap(http://wpdemo.justgreen.in/as/home.php)
This web app lists all the artists who are available for art trade. You can send request to trade your art.
I got some feedback on it. But I am stuck. I don't know what should I do next?
My goal is to on board more artists on my product.
Any suggestions?