So, if not a Convention of the States, your solution is...???
First you would have start by Neutering the Federal Government. Take away its control. If it can not be done then onward to a CC. If that doesn’t work then its time to seriously consider the last option.
You realize, of course, that a Constitutional Convention requires the approval and cooperation of the Federal Government you're trying to neuter.
Which is why a Convention of the States makes so much sense -- the Federal Government is totally out of the loop.