By the look on how many altcoins havent reached their past ATH and not even close to it, holding altcoins is the only thing that is left. But to be honest, I consider altcoins only for a short term hold, as on a long distance, I have only negative experience of holding them. To make it simple, I might better say that bitcoin is for holding, and all altcoins are for trading. The risk of holding and profit is in-commensurable for me. I have earned more with Bitcoin, then with holding altcoins. And I would say that it is easier to hold bitcoin and wait for profit, then to do research and try to buy new altcoins.