For me, no long-tern holding bitcoin and another cryptocurrency can't totally guarantee you that it will be profitable because no one can say that cryptocurrencies price will increase after 2-3 years or in the future. Most people are just saying that if you bought bitcoin at its highest rate, which is almost 20k, just hold it even no one can say that bitcoin's price will increase at that year/ moment. Just hold it and believe that bitcoin can rise again because there are only a few ppl that predicted that bitcoin would reach at 20k. They can only predict if the value will increase or decrease depending on there TA; also, take note that is not 100% accurate. But what are the reason why you invested at bitcoin and other cryptos ? just hold on the reason and don't overthink too much, especially if you can afford to lose the money that you invested.