Stay home? Never.
Vote for a Democrat? Never.
Vote for the Republican nominee? Not necessarily.
In a two-party system, which we most assuredly have, you are making a distinction without a difference.
If you don’t vote for one of the viable candidates (i.e., one of the two major party candidates), you are contributing in a real way to the election of the person who wins. Because one of the two major party candidates WILL win.
Your vote is not only “for” the person you voted for, it is “against” the person you didn’t vote for. IOW, it cancels out a vote “for” that person, thus depriving that person of that vote.
If you don’t do your part to cancel out a vote for Hillary-—by voting the only way that will cancel out her votes, i.e., for the Republican nominee-—you are in all practicality voting for the Rat.
Please don’t take the short view.