Voting for what you actually want to happen is literally the only way to communicate your needs to political parties that they actually listen to.
There are people whose whole education and job is just to know how many people in a given district that the party can pick up by adopting aspects of a particular platform.
Tell them! Tell them that you won’t vote for them unless they take up the antiwar, Medicare for all torch! Tell them that they can’t get your district without a housing guarantee and free school lunch! Tell them to stop the genocide in the only way they listen to!