If you're a trader, then it makes sense to trade these crazy Bitcoin/altcoin swings but if you don't know what you're doing you'll likely loose out in the end. If you're a holder... then look at your original thesis behind your purchase. You should only sell if your thesis changes.
I agree with you. Always keep in check your drive or the reason why you bought those coins in the first place. I am a holder and I believe in etherium and ripple. I am just going to keep holding to these and hope that by end of the year, things will get better.