Sometimes we try everything we can think of to be successful and it doesn't work. That doesn't mean we should give up on our goals, it simply a fact that some seasons are not winning seasons.
If you've ever tried to grow fruit trees or garden vegetables, you know there is much more to having a successful crop than simply plant it and water it. There are years when we can do everything right - watering, protection from freezing temps, sunlight, fertilizer, etc - but the crop doesn't yield what we were hoping for. This is the same with our lives, we can do everything right and still not get the results we wanted.
If we learn from these situations, we will be better prepared in the future.