Whether you have one goal or several, if you are not precise about your aim, you will miss. Working on a skill occasionally will not make you an expert. Regular, frequent practice should result in improvement. If not, you may need to set a new target.
The virtues of goal setting are being touted by many leaders in the professional arena. Determining if a goal is realistic is really not an indicator of potential success. The dedication and investment allotted to see the dream realized will anchor the target in place.
It may be time to set a new target, replace it, or even enlarge it. As a writer, I have learned that consistent commitment to blogging, social media, and a dedicated writing schedule produces multiple books and expands my audience. If we only aim to succeed occasionally, we are merely playing a game of chance.