Those are good points. It’s true that systems are very resistant to change. That’s why I’ve suggested identifying a single area in which one could do good for someone and a single individual for whom one could do it.
The easiest place to start is your own family. I’ve been homeschooling for almost 25 years. None of my sons (or daughters) has attended a school until they start community college at 16 or 17.
Brava to you. Not only did your kids no doubt benefit, but the success of the homeschool movement overall has helped to expose the rot that is public aeducation today.