The Preamble states 'we the people'. Via the peoples representatives, the Constitution was put forward and ratified with, and by, the support of we the people. Therefore, we the people wrote the Constitution and we the people ultimately determine what it means, through various means. Now, the States were represented as well and via we the people, the States surrendered some of their powers to the new federal government. Once the 17th Amendment was ratified, the States pretty much lost their representation.
James Madison and Governor Morris wrote the Constitution of the United States.
The representatives took that document to the people to be ratified in each colony. The people of each colony ratified it, and that vote was brought forward by those same representatives. There were no States before the creation of the Constitution of the United States.
The Constitution created the federal government, and converted the Colonies into the States of the United States of America.
Therefore, the States created it. The States own it. The States are the only ones that can destroy it. Each State acts on the will of the people withing that State, since each State is also a republic.
Hence, the United States is a federated republic. It always was. It was never anything else.
The Constitution of the United States created two Houses. The House of Representatives represents the people, using elected officers in designated districts that have little to do with State boundaries; and the Senate, representing the State governments themselves, and elected by the legislatures of those States (which are in turn elected by the people of that State).
The 17th amendment removed the representation of State governments as governments, converting the Senate into just another House of Representatives, but elected along State lines instead of Districts.
I believe the 17th amendment should be repealed. State governments should have representation as governments.
I believe the Senate has violated the Constitution of the United States by requiring a supermajority vote to pass anything according to Article I, Sections 3 and 5. It is time for the 'supermajority' rule to end, and to return to simple majority, except for those cases specifically mentioned in the Constitution.
You are correct that no court owns the Constitution and has no say in modifying it, 'interpreting' it, or to create any law.
Unfortunately, the Supreme Court (and now various lower courts) have done EXACTLY this.