The career arc that built sustainable income for me: writing → transcription → ebooks → editing → content strategy → courses → publications.
Each one came out of work I was already doing. None of it was a hard pivot.
Most "multiple income streams" advice acts like you have to invent each new stream from scratch. You don't. The good ones are usually one degree of separation from what you're already doing — and that close proximity is exactly what makes them work.