Likely, a repeatable income is cobbled together from threads of at least some of the above elements: building a service, offering coaching or consulting, and selling individual products. (View Highlight)
This approach no longer puts all eggs in one basket, which means there’s (in theory) more tolerance for one thread to fail. But it also means that you’re spinning plates in order to try and keep them all working. Because there’s less time for each, and attention is split, there’s a real chance of all of them failing. (View Highlight)
Note: That seems to be the real price you have to pay, the actual skill to have for this kind of lifestyle.