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.