tl;dr: in your situation many people go off and get an MBA. Don't do that. There's a reason there's only one CTO in HBS' 60,000 person alumni database (I am she.) I was a very hands-on CTO for years after a decade of coding, and broadly enjoyed it. But as the teams I managed grew it became increasingly unfulfilling. When you're CTO, you're often excluded from business decisions which have a bigger impact on your team…
Any idea what your new venture will be?
Software eats fulfillment, basically.
Currently FBA (http://services.amazon.com/fulfillment-by-amazon/benefits.ht...) is a 3B$ business without any competitors. There are good reasons for that: it's capital-intensive, technically/operationally/managerially challenging, and can only really be learned by doing.
I've just finished architecting & implementing a 30k package/day distribution system from scratch, I know I can do better. FBA is a surprisingly low bar to clear (they're mathematically/structurally constrained), and the industry hasn't really improved since the 90's. And with the right structuring it can be mostly funded through debt & advance receipts.
Basically, I'm going to pick up where FlexPort (https://www.flexport.com/) leaves off (literally! Ha, logistics joke!) Except in an even less sexy vertical. :)