The post "Having Trouble Finding a Job? Aim Higher" really struck a chord with me. The author (Oztech) makes the case that you should lift your sights for a very practical and pragmatic reason - to look for jobs which require more of the worker and are ideally offer fewer competitors. This is reasonable advice.
But, buried more deeply in the post is the message that you need to aim higher in all things - improve your skills to expand your aspirations, work to present yourself better and to take advantage of opportunities and challenges that expand your horizons. All in all, I think it amounts to "not sitting still". Whatever you do that a potential employer or client sees and allows you to set yourself apart will benefit your career.
As you can tell, I believe that improving your communication and presentation skills are a key and achievable way to do this. It all comes down to "How high do you want to aim?"