Personally I think of Term Limits as being the "bait". It's the one thing you can easily convince people to get behind, regardless of party, and stands as a civics lesson for the normies. Things like repealing the direct elections of senators or whatnot can come in future conventions once precedent is set and people have a better idea of how and why this works.

Also, a convention like this has never been successful in the past, precisely because congress would step in, do the amendment themselves, and take all the credit. But we would not expect them to do this for term limits. So it makes a good "demo" for the process to play out.

And yes, I definitely recommend Mark Levin's book. It's an excellent primer for somebody just getting into this.