You cant let this failure stop you. Many of the worlds most successful people have failed many times before finally achieving success.

Nor can you let the fact that investors were involved get you down. Investment is about risk, not guarantees. Your investors knew, or should have known that.

Investment is speculating.

The only guarantee you owe them is that you did your best. If your best wasnt good enough this time, so fucking what?

You can only do your best today. Tomorrow's best is different, because you learned from today.

Dust yourself off, reach into your idea drawer, pick out the next one and start again. Maybe it works maybe it doesn't.

Some will, some won't, so what? On to the next. You learn from each attempt.