You're very patient. It's been quite a while for some of us.
Shortly after the 2010 election, which gave the GOP a majority in the House, the Tea Party was systematically shut out and marginalized by the Republican leadership. This would be the same “leadership” that wouldn’t be in place if not for the efforts of the Tea Party. That ingratitude and disloyalty for me was a major turning point. It was all too clear that the GOP clearly had no interest in working with the Tea Party or supporting conservative goals. They are basically Democrat Light.
But to your point, the GOP has indeed been “turning” for quite some time.