One particular strategy of trading can't be use all the time.
Buy low and sell high will work all the time. It is an age old method and it always works. Point is that most traders fail to use it properly. They buy when everyone else is buying and sell when everyone else is selling, while they should be doing the opposite.
For very low time preference schedules of HODLing, it will not work on every coin. Many coins crash from their ATH and never recover. Bitcoin, and the very few of shitcoins, to be fair to them, are the only cryptocurrencies that have an increasing number of users/HODLers that believe in them, as a protocol, as a hedge, and as an investment.