Investing and holding is really profitable like you rightly said but you much know what you are investing on if you want to make real profits. If you talk about investing in bitcoin, then you are on the right track that makes your investment get better with time. But if your investment is to a shitcoin such as we have littered in CMC and Coingecko, then you are setting yourself up to be roasted and the longer you hold, the more your money tends to zero. So be careful of what you invest in and hold because not everything is worth the investment.