Spanish language ads will pay big dividends.
Easy ad to make. The one where the Democrats call them "Latinx".
If you want to have massive impact on a low budget, put up billboards in Spanish near every locations where illegal immigrants congregate that say “Non Citizen voting is a felony that can get you can be deported”.
If the Democrats ignore you, you have supplied useful information to a vulnerable population. If the Democrats attack you, all the better, because your information is amplified.