Well, the failure of business is not the death of that business, but rather it's should be seen as learning period for success of the business to be achieved. Surprisingly, failure is necessary for business successes. And so, if your business has failed, it's the perfect time for you to learn from the failure and make the needed corrections for sustainable success.
First of all, you have to dare to change the business model that failed. Changing the model would offer you the opportunity to evaluate the old model and what went wrong with it. Try to get professional advise from those who have been in the line of business. These professional will guide you on what you need to do to get your business moving again.
Finally, take action based on the advise received from these professionals, and trust in God that this time around success would not elude you.