That's awesome to hear. I'm curious how you were able to find this setup? Did you apply for full time jobs and ask for part time? Or did you start out full time and then make the change after demonstrating value?
I've been contracting for 2 years now and lately I strongly prioritised the company culture and personal interest in the company over money. Turns out this way I found a really good cultural fit and people I can work with. They invited me to join as permie and I am strongly considering it as it seems it would allow me to do the most in my life while living comfortably.
Flexibility seems to cost you ~20% of your normal rate - at least I'm confident my daily rate could be 20% higher if I wanted elsewhere.
I don't have much practical advice here, but my path was to have done good work in the past (reference checks), have an existing connection, and to not be afraid to negotiate hard at the beginning.