What are some simple things I can build by myself?
You're already successful at selling enterprise services to at least one company in management and backend data processing. Have you considered selling management and backend data processing advise, perhaps delivered in the form of a PDF or series of videos? This is stupendously valuable to tech companies if you meaningfully improve on what they have already and would allow you to sell to people who have expense accounts tied to, to steal a friend's phrase, the economic engine of the planet.
You don't need a commandingly high bar of programming sophistication to sell books. There exist services that can do all the heavy lifting for you. If you prefer knocking together a site to sell your own books, it is essentially an hour to get the minimum thing to charge money and ~2 days to get something which could plausibly be the kernel of an ongoing business.
You're already successful at selling enterprise services to at least one company in management and backend data processing. Have you considered selling management and backend data processing advise, perhaps delivered in the form of a PDF or series of videos? This is stupendously valuable to tech companies if you meaningfully improve on what they have already and would allow you to sell to people who have expense accounts tied to, to steal a friend's phrase, the economic engine of the planet.
You don't need a commandingly high bar of programming sophistication to sell books. There exist services that can do all the heavy lifting for you. If you prefer knocking together a site to sell your own books, it is essentially an hour to get the minimum thing to charge money and ~2 days to get something which could plausibly be the kernel of an ongoing business.