Is it possible to launch and maintain a successful and profitable business as a one-person team?

Absolutely! Checkout @levelsio on twitter; he is solo running two 500k+/year run rate apps and is building a third as we speak.

In fact, one business owner can develop his business quite successfully. I am a dentist by profession, well, you decide to do business with a diploma. The first issue was finding clients. I was advised to try option call tracking for dentist from https://dialics.com/blog/call-tr.... I decided to take a chance and did not regret a bit, because I gained a good client base. Automating many functions will help you become successful.