The moment you own your part is the moment your part becomes changeable.

Nothing that stays outside your responsibility is available for you to change. That is the practical use of owning a part, whatever its size, because ownership is what puts a thing inside your reach. It is not about accepting more guilt. It is about relocating a piece of the situation to where you can work on it.

In a stuck situation, find the smallest piece that is genuinely yours and claim it out loud. Then change that piece. The rest of the situation frequently moves in response, which is surprising the first few times.