Review all the facts. Cross-reference everything. Read the material you know going in will be controversial to your core beliefs. You’d be surprised what you will learn. During the four years between elections, make sure you know how to vote, where to vote, and all the candidates that are up for election. If your state allows early voting via mail-in ballots, take advantage of it.
In my state, you can track your mail-in ballot from the time you request it, to when the voting admin receives it, when they process it, when they send it to you, when it arrives, and when they receive it back from you.