While consulting is the easiest way to make money, it’s not without challenge.
Daniel has already made the point that selling anything online is difficult and selling consulting is no exception.
Consulting is not the kind of profit model where you can make money in your sleep. On the contrary, with consulting, any money you make is the result of you working directly with a customer which is time consuming.
While you by no means need a popular blog to make money with consulting, you do need to have some kind of an audience. Having a strong presence in the search engines can also help you find clients. Additionally, consider having a YouTube channel to showcase your knowledge which can help you tap into an even greater audience and more potential customers.