And Now for Something Completely Different

After some relatively successful time freelancing on upwork, while i'll continue doing that on the side, i'm starting to dream of a potential future that i won't be paid hourly but rather will have something of my own.

Have any of you been successful in transitioning from a contractor to a founder? Or launched your own products? Wrote a book for yourself? Or a mobile app?

Would love to hear your journeys in doing so!