Raising the costs for bad actors.
Winds of change had a great summary of all the votor fraud/intimidation scandals that are out there. He made a point to note that this is bi-partisan and has examples of foul play on both sides of the aisle. Although he notes

Fund, who has written Stealing Elections: How Voter Fraud Threatens Our Democracy, describes the extent of this problem. It's not exclusive to one party, as he notes very clearly, but let's just say that there's strong Democratic Party representation in the case studies.

Katzman notes the RNC campaign office shootings, yard sign destructions, votor fraud incidents currently in the mix, and the Florida "purge" lists.

Note: I thought I would put the word purge in scare quotes. Don't ask why.