Goals can be set on any topic imaginable but if you don’t have a sense of purpose, it makes it is easy to give up once the initial motivation and excitement wears off. What's your why? Understanding how your goal is relevant to you allows you to persevere even when the going gets tough.
Quick Fix: When setting your SMART goal, ask yourself how the goal is relevant to your life and what you want to achieve. Why did I choose this in the first place?