This is such a good attitude! I cut all meat out of my diet a long time ago, and when I mention it, people often say something like "I'd love to but I couldn't commit to never having meat again".
You don't have to! It's amazing if you do, but you're still gonna make a sizable impact on the cause you care about if you reduce your intake.
It's odd that people don't have this with other issues, the idea of "reducing purchases of disposable plastic" or "buying fairtrade more" make total sense to people, but food is still often cashed out in these "all or nothing" terms.
I think that's a really strong argument for voting with choice you have, not the one you should have.
It makes me sad to hear you say voting Greens "weighs heavy" on you though! Democracy often isn't as strong as it should be, and people are forced between supporting candidates they dislike, or accepting their vote won't count, but that isn't your fault!
This article is a really good think piece on how to vote. But if people choose to vote for neither of the two major candidates, I really hope nodody feels bad about it. The system sucks, not the voters!