Altcoin is not increasing for so many days. New money is not coming in market.So Always invest in good Top 30 Altcoins for being Safe.
This rule is useless cause it works now but the things may change soon and you will see the opposite strategies working much better than yours. The key factor here is to feel the market and wait for the right moment.
The reason why investing only in the altcoins in the top 30 as a way to try to secure your investment is wrong is because we have seen in the past many coins that got even to the top 10 and then they crashed in a spectacular way.
If you are investing in altcoins there is no way to protect yourself completely from the bad effects that you could suffer if you choose the wrong coin, the only way in which you can do this is to monitor your coins constantly and in the case something goes wrong you immediately sell your coins.