As a holder it's not healthy to avoid watching the crypto market from time to time, most especially now that we have so many new altcoins, you can't invest in new altcoins and not keep a serious watch on them because anything can happen, I've been able to pull out my money from a altcoin before it collapse because I'm on watch
That is why crypto/altcoin is different with Bitcoin.
Altcoins are recommended for short term holding since it's full of pump and dump scheme, it's why you need to look the market what will happen with your coins... just like trading.
When you missed the opportunity to sell at the peak, the price will goes down significantly. While Bitcoin even it's dropped, surely in the long run the price will recover and that's the opportunity to buy the dip.