Q says clearly: "How do you 'safeguard' US elections post-POTUS?"

I think what that meant is that if they merely counteracted or stopped the fraud from being committed in this election (like what allegedly happened in 2016, with white hats DDOSing the Dominion servers) without exposing it, they wouldn't bring the whole fraudulent system down, and we'd have the same fraud problem four years from now. He's saying they want to end election fraud once and for all.