It’s about having your desires counted on the public record.
Get your desires on the public record in local and state elections and primaries where it might actually matter. For a US presidential election it’s an entirely empty gesture that makes you and only you feel better. No policies will change. No causes will be advanced. History will not remember you. It is very likely, however, that will make the lives of vulnerable people inside and outside of this country worse by giving trump a second term.