I always vote for the lesser evil which is why voting D or R isn't even a consideration for me. It's hard for some people to grasp, but if you vote for someone who is pro-genocide, it doesn't really get any "more evil" so you shouldn't vote for either.
You could also just use your head and realize that while it's useless to vote for third-party candidates in presidential elections in the US and still affect change by actually getting involved with politics. Like... voting is the absolute bare fucking minimum and if that's what you think is going to cause change I don't know what to think of you other than you clearly haven't thought about how to accomplish your goals very much.