这是一个条件状语从句，使用了fail to do结构表示“未能做某事”，以及remain out of reach这一固定搭配表示“遥不可及”，表达地道。
Many people are surprised to discover that their failure to achieve the goals they strive for often stems from setting primary goals that are too small and vague, leading to a loss of motivation. If your main goal fails to stimulate your imagination, its realization will remain out of reach. Therefore, what truly inspires you to strive forward is establishing a grand and specific long-term goal.
许多人惊讶地发现，自己未能实现孜孜以求的目标，原因往往在于主要目标设定得过于渺小且模糊，从而导致动力丧失。如果主要目标无法激发你的想象力，那么目标的实现将遥遥无期。因此，真正能激励你奋发向上的，是确立一个既宏伟又具体的远大目标。