The chances of your vote being the one to change the outcome of a large election are extremely small, so it doesn't really matter that much what you do with your ballot. However, if you have the means to influence other people's votes, that might count for something. Therefore, I think it's good to discourage people from voting for the apparent lesser of two evils. If you vote, try to vote as best as you can for your class interests. (Chances are that you belong to the working class.) Don't feel bad about abstaining if the candidates to choose from represent class interests that are counter to yours to the extent that you can barely tell them apart.

In 2020 I voted 3rd party. No illusion of them winning I just wanted to vote in a way that could help demonstrate to the 2 parties that there's a important segment of Americans that they're overlooking.

If a third party gets enough of a percentile where they could decide if Reps or Dems win we might see them adapt to have policies that cater closer to the desires of that third party.

But what's more important is your local elections. The president is much less important in your life than your governor or mayor is.