@bethanymarz
I think of it less as "part time work" and more about carving out "project-based work" that you can chunk and essentially sell as separate services.
examples could be: technical architecture review, smart contract review, infrastructure audit, new vendor/tooling review, overseeing a specific engineering launch or initiative, fractional CTO work to oversee a team etc, etc.
i'd think about the side of engineering that you are strongest at, and how you could turn that into a repeatable, scalable project