I don’t know if I’ve “made it”, but two years ago I started a small consultancy which increased my per-hour billing to almost triple compared to when I was an employee doing the same thing. I use this extra cash flow to work 25-30 hour weeks.
Recently, I started to offer this setup “as a platform” to previous co-workers taking a 20% cut of their billing. If I get to five I can stop working all together.