I see a good buying opportunity in some undervalued altcoins at the moment. The following coins have dropped more than 90% from the all-time high - ZCash (ZEC), QTUM and Stratis (STRAT). The important point here is that they have always been in the Top 30 list at Coinmarketcap.
I have not checked any fundamentals about them yet but looked at their charts and they seem underpriced at the moment.
ZCash (ZEC)
ZEC/BTC broke the all-time low around 0.165 and then rallied. This means that below this low there were some serious buyers that pushed price higher right away. I won't be surprised if they start buying again once price gets back around the 0.018 support level.
QTUM
QTUM/BTC also rallied after it broke the all-time low. At the moment price is below this low but if it drops down below 0.00055 it may start to rally, since the buyers showed up at these prices initially.
STRAT
STRAT/BTC reached the accumulation zone from late 2017 which caused price to rally in 2018. Now that it rallied the last few weeks it also created a new support level around 0.00020. At the moment price is reacting from the resistance level around 0.00024 but if it gets down the the support once again it may present a good buying opportunity.
In general I see these as great short term buys, since these coins have always been high in the Coinmarketcap rankings and have dropped pretty significantly in the last few months. I think that they have good upside potential, compared to a lot of other altcoins.
Good Luck