I favor a constitutional amendment that repeals the income tax and institutes representative apportionment. Take last years spending, divide it down to a per Senator and per Representative charge. Then the federal government will bill the states for the taxes required.
Let each state figure out how best to meet it’s tax burden. As an enforcement, prohibit the states from spending any money until the federal tax bill is paid.
That’s essentially how they did it in the early days of the Republic.