I would try to focus on the point "why we need work". There are a high range of industries you may have contributed to and you seem to regret what you have done, yet do not forget that we work for life not live for work. In other words, if you are not content with your life, no matter what work you do or however much money you earn, you might be unable to be a good happy worker. Tracing to the origin of life, probably just choose work that may satisfy you and your family. That is all, I consider.
In my view, to run a small business is the most hilarious journey worthy to invest in any way.