Yes, I understand the argument you are making for choosing the lesser of two evils in the current political environment. My rebuttal would be that there is zero hope of making meaningful systemic changes as long as we are settling for the Bidens and Trumps that nobody wants, or even Obamas that people do want. I see what you are advocating for as the thing that is discouraging, accepting an unacceptable scenario because your options have been artificially restricted to two unacceptable choices.

I think of it like this: if more people thought like me and were willing to forsake their party when the National Committee does whats good for the donors rather than the people, then they would have to do more of what the people wanted to prevent us from defecting. This DNC/RNC locking us into choosing the lesser of two evils is only the case because you are stuck in this paradigm, if other people reject it, it would cease to exist, its a self-fulfilling prophecy, i.e. people choose to vote for only the candidates they think their neighbors will support, but their neighbor only supports them because they think you will only support them, so nobody wants them, but everyone feels trapped into voting for them anyway. The only way out is enough people voting 3rd party to force them to listen to voters rather than donors