Avram in MD:
Not a good supposition, no. Your premises are faulty throughout.
What do you mean “the Jewish people should do in order to make teshuva”?
The Jewish presence in Eretz Yisrael long predates Zionism, and does not require teshuva for living in Eretz Yisrael with no political rule or ambition and with permission of the nations.
Incidentally, Rav SRH was very against the observant movement Chovevei Tziyon, who were not Zionists, and, chacham adif miNavi, sure enough, “Religious Zionism” and Zionism are both good examples of how correct he was.
On the other hand, if your question is what should the Zionists do to stop their ill-conceived and shmad-fueled rule of Eretz Yisrael, as in what Teshuva can they do?
The very least they could do is stop shmading our brethren and they could also renounce Zionism in favor of Judaism, for starters. True, there are other significant issues remaining. But that would be a good start.