I’ve spent a decent chunk of time “influencing without authority” in a corporate environment and learned very quickly that people won’t do things that they are not incentivized to do.
The “story” you are telling is weak as fuck. You are effectively saying that Biden can safely ignore primaries because the rest of the party will vote for him anyway.
If you want the lesser evil to improve or be replaced, you need to let the greater evil win. Otherwise, why would the lesser evil actually change?