If done without planning and intention, a goal could inadvertently hurt a growth mindset. Most people might fail with a vague or lofty goal and then think, “See? I can't do it anyway.” Just by setting a goal, you are taking an active role in driving new and better results in your life. When tackled correctly, they force you out of your comfort zone and help you grow more than you would without them.
Any and every goal achieved should be acknowledged and rewarded in some way. The longer the goal takes to achieve, such as over the course of the year, the reward may be larger.