If you can not handle other altcoins its normal for you to invest in bitcoin or ethereum other altcoins are hard to predict prices if the price of bitcoin is almost dropping and it will cause other altcoins.
There's a domino effect if bitcoin is stumbling, this would affect the other altcoins and that's a very known character of btc. The price are disappointing if most of your portfolio lies on altcoins and you don't prepare on this situation because you have invested into altcoins.
But while you're giving them a reminder to invest on bitcoin, I doubt it that they'll listen to it if they are currently in loss.