Republicans would need control of at least 34 state legislatures to be able to call such a convention, and 37 to ratify any amendments.
So far they have unified control of 31 state legislatures. Of those 31, 19 have signed onto an application for an Article V Convention put forward by Convention of States, a conservative activist group.
https://www.businessinsider.com/constitutional-convention-conservative-scholar-states-2022-8
https://www.businessinsider.com/constitutional-convention-conservatives-republicans-constitution-supreme-court-2022-7
Its really hard to say, because I think functionally 99% of americans have no understanding of how this stuff works, how to organize with a union, how a general strike works, etc. I think what you'd see is just a series of disconnected left wing gatherings that get shot by police or newly empowered militias.
I suspect a constitutional convention would ban 'communism' in order to justify executing dissidents.