Yeah, protest is a very powerful and necessary tool. Protesting to push Biden doesn't mean you have to abstain from the election. You can choose to vote for Biden but still make it clear you're not pleased with him. Protest votes in the primary are perfectly acceptable for this reason.

If anything, I think it's better that we protest now rather than later. It's a win win situation to resolve this conflict before the election.

I also believe that voters tend to have more power than non voters. We've seen that politicians are more willing to listen to those that already vote for them.