Back off emotionally and simply be aware of what is happening with the business and with yourself. Be honest in your awareness. Analyze the situation. Analyze what is happening, the marketplace, your actions, your attitudes, your own motivations, your fears and your dreams. Things happen that are beyond our control.
Markets shift, people find other jobs and clients discover other vendors.
That's just the nature of business. It's important to analyze the situation carefully, identify what you can do and can't do, and most importantly, identify what you are willing to do and not do. E. Once you have analyzed the situation, you can create new action plans. Perhaps you need to hire additional staff. Or, it might be better to sub-contract the work.