it's one of the common ways that I often hear in this forum. but the problem is what coins do you currently hold? Although the market is unpredictable, on the one hand not all coins can last a long time in the market, let alone always have a high selling price. keep in mind that investing takes time and not as fast as you expect.
Long-term investing is a very popular way to make a profit in this market but finding a coin that gives you profit will be difficult because the market often goes against what we think. Any investment will have its own risks but there will certainly be a way to reduce the risk if you have a reasonable trading strategy. I have been in this market for a long time but sometimes losing money always happens to me.