Some people say hold your crypto, some says sell immediately that holding for long is useless.
What do you believe and practice?
I can say that there are some coins which are worth keeping for a long time , and other coins worth to sell , but in this market it is better to be out of the market and wait for the right time to buy
Timing is absolute like pricing. It is depend on timing to draw a right graphic with given numbers and trading this numbers is harder than drawing it in this comparison. Some coins are worth to hold but projects with working product don't let you wait for years.