Which particular state are you taking about here? And which electoral office? There was no presidential election in 2018.
Don’t outright dismiss rhinohunter concern.
We were told on this site about the “great” Republican registration numbers and ev in 2018 and the predictions flew around here about keeping the house etc. Including from you.
However the R votes never materialized in 2018 at the voting booth and in some purple districts the R’s went for the Dem.
Prepare for anything.