Excellent responses and advice here, particularly by Steve and Brian, and with which I concur. Start-up failure in the first couple of years is as much as 95%. The number one reason is "owner/founder's ego" and the number two is cash and cash flow management. One of the best things to do, is to sit back and objectively review why - the how, the what - the venture failed. What could have been done to prevent failure. Usually there is a trend or a pattern that will become evident. Also, none of this happens overnight. To a trained observer, the "sickness" is in place long before the illness becomes obvious, or too obvious, and by that time, too late to save. So, what happened in your experience? Dig deep, ask yourself why to a level of five (a "why" to each answer until you get to the root of the matter).
A start-up failure is not necessarily a failure - perhaps it was a trial run for later. What did you learn, what experience did you gain. What do you know now that you would never have known if you hadn't "failed". Real success is linked to many failures on the way. Learn and move forward - as Gaurav also advised.
In our Entrepreneurs Blueprint, we cover the 11 essential areas of Must-do's that will lead to success. These eleven come from analysis of thousands of entrepreneurs, the few who made it and the majority who did not. The eleven are cost-free, but require serious dedication, desire and commitment. If these are performed well, attracting investors is significantly easier. Money is there if you are prepared.
Don't give up. Do your homework and start-up again.