That's assuming you have no transferrable skills from one career to the next and that there's a well-mapped career path in existence for a given role.

What about new careers that suddenly pop into existence around nascent technologies like AI?

I've transferred into product management now that enough companies officially recognise it as a career. I had been doing it in various guises for years where it was called 'project designer', 'project manager' or 'programme manager'.

Regardless of title, the common theme has been aligning business needs and engineering needs to deliver customer value they're willing to pay for. That meant I didn't start at the bottom when 'moving career'.

I don't think OP is talking about a mere title change when asking about career changes. I've had lots of different titles when I change companies or old titles become unfashionable, but only maybe one career change.