The point is not to just make a prediction, but to act on it.
What have you done with the money you pulled out of the markets, if that is what you did? A wrong prediction does mot make one a failure—in the extreme case, you could have been very wrong about the markets, but very right about a house you bought instead.
Nor does missing out on gains in a speculative arena make one a failure—instead, it makes those who speculated, lucky.
I admit to luck. I write a lot, mbut I don’t know what will happen. The only time one puts one’s foot in one’s mouth is when one criticizes someone else without understanding the target of the criticism, not when one happens to make an incorrect prediction. In investing, it is those with unwavering certitude and self-righteousness who are the failures.