The secret to conquering white supremacy is to do it quietly and to be strategic. No more big movements. The people that run this system and empower it have to be outsmarted, taken by surprise. They can't see you coming. You have to be deceptive and you have to be prepared to be cutthroat. You have to treat beating this system like it's a real-life strategy game, but you first need to know your stuff.
Study every aspect of this system (i.e. historical, political, social, etc.), then create a game plan. Form a group, a SMALL group of like-minded individuals, people you can trust. Ideally this would at first be your family, specifically your own household (i.e. husband, wife, kids, etc.). Set a code. Have a long-term plan, because no, it's not going to happen overnight. Build wealth. Money talks and makes things happen.
Long-story short, it can (and will) be done. Black people who want to "take down the system" are going to have to evolve past big, loud, movements (i.e. Black Lives Matter, etc.) that can be slandered and infiltrated and start exploring more strategic and underground means.