SPX500: The uptrend may continue, but a downswing is imminent

A simple one-year chart, on which I have drawn the 5-year Resistance Line, suggests that, even if the uptrend continues, the price will now swing downwards. I expect it to drop from its present 1976 to 1940 at least. Could this downswing also be the signal for the big correction to happen? I don't know.