From my experience, it is profitable. I prefer short term than long term though in some instances I am forced to hold when prices don't go my way. My technique is that when the current price of altcoin is below by 10% its average price, I buy and then when prices go back to its average value I sell. I don't mind making many 5% trades per day.
Did you mean teknik saya tidak beda jauh dengan teknik anda karena saya rasa itu adalah teknik paling aman dan mudah?
my technique is not much different from your technique
because I think it is the safest and easiest technique