SGN tokens have been dumped by stupid investors (a panic-sellers) plus stupid redistribution strategy. How stupid can they get? sell at the price lower than ICO. The only way to improve this situation that is advertisement or big exchange.
I don't think investors are dropping their purchased tokens right now because there's no point in them doing that right now. Smart people who believe in the project are now just trying to buy at this low price. Advertising is not needed now, because it only recently ended. But a large exchange would be good news for everyone.