Luck is when preparation meets opportunity. Your preparation gave your kids an opportunity they wouldn't have had otherwise.
There is quite a push to make parents feel that they are unable to teach their kids and that it needs to be left to "professionals." When COVID sent kids home and gave parents a view into what was actually being learned in the classrooms, I think many discovered that they as parents have quite a bit more skill in teaching their kids than they had realized.
I'm not trying to bash the public school system, but the kids that get the best education are the ones where the parents see the school system as an institution they are partnering with to educate their child instead of the place that is responsible for the education.