If I understand correctly, the problem is at the state level. The national congress doesn't draw district boundaries, mostly state legislatures do (though there

If I understand correctly, the problem is at the state level. The national congress doesn't draw district boundaries, mostly state legislatures do (though there are exceptions who have independent redistricting committees). As the state-originating path to a US Constitutional amendment requires the participation of state legislatures, it's unlikely it could be used to fix the problem.