Possible, but that time is not now. It is not true that the third parties aren't taken seriously, and I'm also not saying that they don't have some good candidates, just that they don't come anywhere close to being strong enough to win either popularly or electorally. Voting for them right now would be kind of stupid and wasteful, even if it might make you feel better. I would strongly urge you not to vote third party, because any vote that isn't for the Democratic nominee, might as well be a vote for impeached El Comandante Cheeto Poppycock. Even though presumptive nominee Biden is not the person I wanted to vote for in November, and I don't really even like the man, I will still vote for him, absolutely must vote for him, because the alternative is four more years of impeached El Comandante Cheeto Poppycock, basically Hell on Earth.