A player is only as good as they are comfortable. As many people will tell you, consistency is the key to great aim, which is why I'm trash (new sensitivity every week stay tuned).
So to answer your question: maybe. A new mouse can make you better. So can a new mousepad, a new keyboard, chair, desk, house, puppy, etc. The important thing is that whatever hardware you pick, you like. 5600 DPI doesn't matter, but maybe having 5 side buttons will, so pay attention to physical attributes.