Ok a nice tip to remember when investing in Altcoin's is that hype builds fast!
Take DGB for example, with the recent Citibank challenge the price rose as high as 2600+
They didn't win which was to be expected but the price lost 50% rapidly. This trend happens quite often.
Most recently was with Antshares with it doubling day on day leading up to the recent conference in China. Which was held in Microsoft's headquarters btw. But no big announcement was made so the price lost 50%.

Just pay attention to upcoming market releases, conferences etc and sell before they happen, safest way to maximize profit in my experience