Good Question, uh, I mean Point!
The question is how to get corporate and government parties to join a boycott of Israel. The only way to do that would be to get ordinary Americans to boycott the local corporations and organizations that do business with Israel, thereby convincing them that a boycott Israel is in their best interest.
Unfortunately, to implement that step, we would have to convince ordinary Americans that a boycott of Israel is in the interest of World Peace, and of the Israeli people (who would be primary beneficiaries of said World Peace). Then they might suddenly develop an interest in the boycott, which would propagate to the corporations and government.
But the corporations control the press, and in a broad sense, the press controls the people. So we have a circular trap. Like with everything related to Israel.