It’s the states that decide on Constitutional amendments.
The states can and should go for 100% state appointment.
“The Congress...on the Application of the Legislatures of two thirds of the several States, shall call a Convention for proposing Amendments, which, in either Case, shall be valid to all Intents and Purposes, as Part of this Constitution, when ratified by the Legislatures of three fourths of the several States...as...the...Mode of Ratification...may be proposed by the Congress....”
We can get a convention in session and we can allow an indefinite amount of time for 38 states to ratify convention proposed amendments.
I’m pretty sure the Article V convention is going to start in January. I haven’t been keeping up with the details, but it looks like they’re going to try. I just hope they make the most of the opportunity.