Another idea: line up some dev consulting work that would enable you to spend more time per week (in aggregate) than the 2-3 hours per day you're spending now. Consulting offers higher hourly wages and more flexibility, generally speaking.
There are clear downsides too. You would need to source these contracts yourself and figure out health insurance for your family.
There are clear downsides too. You would need to source these contracts yourself and figure out health insurance for your family.