It's nearly impossible to rig a congressional election. There are just too many seats. In a Presidential election, you only have to rig one race in the seven swing states, which was much easier.

MAGA tried a bunch of stuff, and none of it worked. They had plans for post-election, and if the races had been close it might have worked, but they got their nuts stomped so hard, so widely, that they could NEVER rig it enough.