Not all people are able to hold Bitcoin for several years. Moreover, newbies, most of them are panic and falling to sell out their Bitcoin once the price suddenly drops. That's bad.
And some people may not have good funds for a long-term hold.
People who are not able to hold Bitcoins for a long time need to understand that they are trading with more than they should be. If you only trade with what you can afford, then you don't panic at all. Similarly, people who don't have funds for long-term hold need to build capital before trading.
Trading isn't meant for everyone because it requires some skills along with capital, a harsh reality. If you enter the trading world with a small amount of money, you will just end up gifting them to whales who will manipulate the market regularly.
If you want to trade, make up your mind and analyze how you will do it. Just saying "I'll trade from today" doesn't guarantee you success.