When investing in cryptocurrency for the long term, it usually implies that even if you bought at the worst possible time and held for a very long time, you still made a profit each year. By simply holding long-term investments.
it depends on what cryptoqurrency you invest, i believe if you hold bitcoin in long term it will not make you lose. but if you invest in the top altcoins at least you can get profit in a certain term, it is important you need to monitor too so you don't miss the opportunity to sell.