New states cannot be formed from the territory of existing states without the consent of their state legislatures - movements like this are always going to founder long before they get anywhere unless the other parts of the state also feel like they would be happier with a division. And with a few exceptions like New York, I just don’t see that happening.
Got a notion here.
Solid conservative majority in Congress and in a number of states.
Split TX into 5 solid conservative majority states and 2 liberal ones. They now have 10 conservative senators and 4 liberals.
Rinse and repeat for other states as needed. Permanent conservative majority, at least in the Senate.
And perfectly constitutional.