Half a year is too short a period to draw conclusions about the unsuccessful investments in altcoins.
Especially, how difficult were the last six months. Many investors suffered losses, buying bitcoins above $10,000.
In June 2017, I bought 5 altcoins and they fell by 75-80 percent by September 2017. In January 2018, when all the crypto-currency market was madly growing,
my investments brought me x3 profit.