The strongest comeback is structurally different from the collapse.

Returning with the same structure that failed and more willpower rarely works, because the structure was the problem. A real comeback usually looks different in its bones: different assumptions, different pace, different support. If nothing about the architecture changed, you are mostly repeating with hope.

Compare your new plan to the old one and ask what is structurally different rather than what is more determined. If the answer is only effort, keep working on the design. The difference should be visible from the outside.