Don't believe for one moment that 5 hours on Product Hunt or anywhere else for that matter represents a serious marketing effort.
If you want to run a business rather just create stuff, your work has only just begun. In the light of Facebook and other social media revelations, the idea of a truly disposable email address which means your entire life is not analysed and spammed to death has to be worth something.
You haven't told anyone about it though. And I mean you shout from the rooftops every day and everywhere you can think of. You market. People are not going to come looking for you. You have to start approaching influencers, be seen and be heard everywhere you think your potential users might lurk.
And, by the way, everyone sees a million new ideas a day so you have to be consistent, appear to be permanent and appear to be solid. No-one is going to entrust communications with you if they think you are a small, one-man band with an idea and little else.
Time to start reading marketing articles and strategies and applying them.
And expect it to take time.