Ask HN: Transitioning from engineering management to a business role?

Hi all,

I'd like to transition from my current role as an engineering manager at [major SV hardware/software company] to a more strategic, business-oriented role at a startup (note: I want to remain deeply involved in the product).

However, I have no business experience other than some minor contracting work several years ago.

Has anyone here made a similar transition? What types of things should I focus on or avoid?

Thanks!

[Edit: whitespace]