Whether we realize it or not, all of us are a business of one. Whether you discuss investments, or you discuss clients, the mantra is to diversify your revenue sources. Except for some very specific situations, it is generally considered unhealthy if any one source makes up more than 20% of your revenue stream. To maintain collection of revenue streams, the "business" has to constantly upgrade the product offering (or skill set) to ensure that you can get new clients, and to hold on to the clients you do have. The business has to replace clients (revenue streams) that go away with new clients. There is also the effort of keeping in touch with your client base to make sure you know they will continue to work with you, or give you more business. The business has to also know who/what the competition is, what their offerings are, what their strengths/weaknesses are, and how to position one's own business to counter threats and/or create opportunities.
Of course, when we work as employees for a single employer, then we exchange the effort required to maintain the revenue sources and client base, for the "security" of one income, and one client. That is a relatively safe option IF one's skill set is unique and highly sought-for. It is a dangerous option if the field/position is easily replaced (ie, a commodity position).
There is also the issue of whether what is good for your "client" is good for you. Sometimes the interests are aligned, in which case, you surf the wave as long as it lasts. Sometimes the interests are not - in which case you look for a better opportunity/wave. In the end, we're responsible for ourselves and we have to continually probe whether the place we're at is stable or not, and if it is not stable, where to go to get to stability.
I've been laid off/changed fields three times as an employee. The first was due to a major (but in retrospect cyclical) downturn in the industry I was in. The second was the change of business focus of a multinational. The third was due to the acquisition of our company by another, that was interested in the existing revenue stream and nothing else. I've started up several businesses, and found that it takes a lot of very persistent effort to create the product set, then do the marketing and sales, and then do the customer management, to ensure a more-or-less consistent revenue stream. In the 18 years I have run my business, we've had to continually adapt to changing customer preferences, entry and exit of various competitors, evolution of technology, the economic ebbs and floods, and various hard-to-predict disasters/opportunities and changes in alliances. And unless you run a business of one, you also have to learn how to recruit, train, retain or fire employees who usually do not share your objectives or needs. So it ain't easy.
Dinardy, the advice I was given at one of the "outplacement" consultations was actually very relevant. Know your skill set, then look for the places where that skillset is in demand. For some, it may mean another employer. For others, it may become a series of contract positions. For others, it may become a set of intense but short engagements. Use this moment to assess what makes you happy, what YOU want to do, and where YOU can make the most impact. Then you'll know what you need to do. Good luck.