Also, any executive orders that go beyond the bounds of the discretion allowed by Congress can be overturned by the courts.
An executive order is not a law. A valid executive order merely designates how federal agencies are to apply a law, within reasonable discretion as permitted by Congress. Any EO that goes beyond these bounds has no more legal validity than a proclamation by you or I.
Whether a court would properly make this distinction is of course an entirely separate question.
Cut off funding to the Executive Agencies that are to enforce the Executive Orders. Close them down.