They will suppress the vote even more now they have almost absolute power. It has been done this way in other countries when authoritarians come into power and decide to stay. The mob is running the US now, TOC.
Voting rights (and the election process) are mostly established and controlled by the states, not the federal government. These have been eroded over a period of time, accelerated by the move to the right of SCOTUS, which has rolled back many of the protections against vote suppression and election distortion.
Other than empowering states to suppress more (inspired by MAGA philosophy) and emboldening of SCOTUS, I'm not sure the federal government has many tools to suppress the vote directly. I may be proven naive on this.
I do think the threats - real or implied - against the media might have an effect. And possibly the likes of Elon throwing his money around like confetti will further distort democracy.