What did you learn in the process? What would you tell your older self?
In random order:
Employees watch what you do very carefully. Their behavior is strongly influenced by yours.
Having several conservative ways to make small amounts of money if necessary is good.
Emotional stability is an important skill. The ability to dampen both optimism and anxiety is something that comes with experience, I think. Multiple backup plans help with the latter.
It is relatively easy to siphon off pieces of business when the market is large. Profitable competition tells me that I can probably find buyers, so long as I can think of a twist.
Being a generally friendly, helpful person, even to people who you think have nothing to offer you in return, is good for business. I'm a much friendlier person now than I was when I started. I've also found being friendly and helpful just makes me happy.