Seek Holistic Goodness
In healthy eating and healthy business you need to be diversified to be safe. What works may not keep on working and what's easy may change.
How does this apply to marketing? Lots of ways. When it comes to finding and attracting new customers there are so many options it's hard to know where to start. The best businesses have several viable channels working all the time. You might combine google adwords with LinkedIn outreach, perhaps you do SEO and Facebook advertising. The point is that a one legged table is easy to knock over. Make sure your marketing and business has several legs to support it. If one of your legs becomes weak there's others to support you until you replace it.