And for the altcoins, after buying altcoins, what happens if no one wants to buy them from you? You know a lot of altcoins aren't all that popular so how do people even sell off their altcoins? Can you even hodl altcoins?
This thing can only happen with altcoins, many of them become worthless after sometime and you cannot sell them to anyone, in that case you become a bagholder, this is the reason why it is advisable to hodl altcoins only for the short term. Having said that, another way to avoid this is that you should stay away from new altcoins and buy established coins that have been around for a longer time, newer projects are quicker to fail, thus there is definitely more risk when you buy them.