The reason why the administrative state has expanded as a force and the supreme court has become such an issue, is because the left has for decades outsourced to the courts and to the administration agencies, what it is too afraid to do legislatively, for fear of either angering the donors, or angering the voters, or angering both.
I think campaign finance and lobbying reform would need to first priorities in any given context, because everything else is going to be subjected to their influence and it is a big part of the reason why you have the problems in this country that you do.
I agree Democrats have outsourced to the courts, I don't agree that Democrats have outsourced to administrative government agencies for fear of angering anybody. I think Congress recognizes it doesn't have the expertise to address many of the issues and Republicans have obstructed the U.S Senate for the better part of 30 years now anyway.