Primaries are for shooting your shot on the candidate you like. I took my shot on the candidate I liked, but what I got is Biden. Now I have two choices and only two choices, no matter how I feel about that: Biden and Trump.
That choice should be simple if your ideal candidate is someone to the left of Biden.
And if you decide not to make a choice, that isn't a noble act of rebellion or anything like that, it is simply you empowering the status quo.
I am voting, not for the red/blue party.