If you think that Biden poses anywhere near the threat to democracy that Trump represents, you are incredibly naive. If Trump is reelected, you may not have the opportunity to have a real vote in any subsequent election. Get off your moral molehill and read some history. You don’t have to go back any further than the 1930s in Europe.
Voting is a serious thing. It is not a responsibility to be taken lightly. Ultimately, given the power of the Presidency, it is a life and death decision affecting millions. As a young Army officer in Vietnam, I frequently had to choose among unpalatable alternatives. Failure to choose was not an option. People’s lives were at stake. I do not see your responsibility as any less serious.