There's really nothing for it, not at this stage. Propaganda, marketing, and psychological operations have done all they can.
Voters who remain undecided should seek professional assistance as soon as possible to prevent injury from overwrought hand-wringing, or other long-term damage. The rest of us will struggle on and try to do what we think best.
* * * * *
Many will see today as the last full-spectrum day of candidate drum-beating, tambourine-shaking, and stump-smoldering speechifying. There may be a regretful tear at this realization and news.