> I recommend one focus on a domain (insurance IT, healthcare IT, etc.)

So that others benefit from my experience: the cheat code to this is to work in marketing tech. You will have domain experience in all of these in a relatively short time because you will have had to deal with partners & clients from these domains.

You also learn very quickly how any company makes its money, what they consider positive contributions to the bottom line and how you can be one of those.

Except for at the fringes of new tech, traditional business is far more personally rewarding than working in the seeking-funding startup snakepit.