Perhaps you mean buy and sella is trading. I think trading can indeed provide a great advantage of the dump and pump that occurred and requires a relatively short time. but with the risk of us losing money every trading becomes larger. different if we simply holding bitcoin because I think the risk is small, but well holding bitcoin for investment does require a long time.
If you want to make higher profits only by holding then you need to wait for a long time as we never know when price will reach to the all time high.
Yeah, indeed if only holding bitcoin will be quite long and well the price is erratic. But what if we have a lot the stock of bitcoin , then with it the same time we can get more profit. And if it only has a little capital, it is not recommend. But if you are trading altcoin then with a bit of capital that is okay, while we learn.