Your primary is done. Did you rack it into a carboy? And no, don't add anything to try and get the yeast fermenting. It's nearly done and cannot assimilate anything. Anything you add now will remain diluted in your must and can affect its taste. The only thing you can add in the near future is sorbate to stabilize, if that's your thing. For now I'd rack it into a nice sterile carboy, put an airlock on it and let the yeast ferment the last tiny bits they still can before they go belly up for good.