When we fail we are forced to change. Change is good. It brings new things into our lives. There is a sayingt that goes something like this:
If you want to change the world, change your country. If you want to changeyour country, change your town. If you want to change your town, change your neighborhood. If you want to change your neighborhood, change your home. If you want to change your home, you gotta change yourself.
Failure is the mechanism through which we receive feedback to make sure the change we are doing is positive. Dont shy away from it. Run towards it and embrace. For it will set you free.
After a few have done that, write a post titled "How my failed startup helped me succeed" or similar. In this post be very transparent about why your first startup failed to deliver, but don't ever put blame on anyone but yourself. Take responsibility for the failure. Talk about what you learned and how those lessons are helping you deliver for your current clients. In your post link to the articles your current clients wrote and briefly mention why they're happy.
Afterwards, promote the shit out of your post.
What this accomplishes:
1. It takes away any power a person would have in bringing up your past failure because you've spun it in a positive way. This will give you the confidence to talk about ideas moving forward. You will always be able to take negative criticism of your past failure and spin it to talk about how it lead to your current success.
2. You've given people a good story. People like good stories, and they love good story tellers.
3. Using your current clients endorsement you prove that you can deliver.
Just some rough thoughts. Sorry for the bad grammer. I just don't care enough to correct them. Hope this helps.