Even if you did convene a convention, you could not reign in SCOTUS without repealing the 17th Amendment and requiring that each state government (rather than the people of the state as under 17A) select that states senators.And if you really wanted to rein in SCOTUS by constitutional amendment, you would name the actual names of the justices of SCOTUS. Which would dramatize the ability to actually override the lifetime appointment nature of the SCOTUS justice job.
The right way to modify SCOTUS would be to require that the most senior SCOTUS justices retire (subject to temporary reinstatement to fill vacancies) as necessary to hold the number of justices down to 11, even tho each newly inaugurated POTUS would name two new justices (which would map to a 22-year term for each new justice).
But I doubt that any such amendments can be ratified, unfortunately . . .
It would be great if the states met, decided they couldn't agree on anything, and didn't adjourn sine die but instead planned on another convention the next year.
Meeting and showing that delegates didn't "run away" would fundamentally change the political landscape for the better.