Once it is convened, how do you constrain a Constitutional Convention within the purposes for which it has ostensibly been called?
You can’t,, a Con con is a nightmare that would codify all the cutural rot that the left has filled our kids with.
If we cannot win at the ballot box, what in gods name makes anyone think we would rule the roost at a con con?
We would wind up with a UN style, or Soviet style constitution, complete with rights of the child, rights to a job, rights to healthcare, etc etc.
An amendment, and winning elections is the only way.
The last time we had anything like that was a convention to propose changes to the Articles of Confederation. It ended up chucking out the entire government of the United States and starting again. And this time we don't have greats like Madison to propose the changes.