Beware of organizations and educational institutions that prey on job-seekers' anxiety, the ones that promise that if you pay them lots of money, they will take care of you. Before spending any money or investing your valuable time pursuing additional education, interview people who have actually completed programs of the type you are considering, or peruse job postings to ensure that the degree or credential you might obtain is actually valued by employers. The era of online job search has not changed the basic employment truth that people prefer to hire someone that they either know personally or who comes highly recommended by someone trustworthy. The only way to know more people who can advocate for you is to be more visible in your professional specialization AND to make a good impression. For ideas on how to increase your visibility, see the next strategy.
Different people prefer different modes of career networking that play to their strengths.
Introverts may enjoy publishing articles and joining online networking forums, while extroverts may prefer public speaking and group meetings of industry associations. Job hunting is stressful enough - do not force yourself to do things that deplete your energy, bore you, or ruin your mood. Timing matters, too. If you are not a morning person, skip breakfast meetings. Great salespersons know that reaching quota requires volume.