You're right, but from my point of view, besides investing in a coin, it's ok and try to trade at the same time.
That always make anyone to have a pretty good edge over an investor who is just going the HODL way. One thing about investment is that if you do not have a trading knowledge, at least long term, you just have to realize you have nothing else to do than to stick with what you are holding and look forward to the long term whatever the short term outcome may be like. However, with some good trading knowledge with it, even if it is long term trading, you will always be able to take advantage of the trends to your advantage. Altcoins are pretty more volatile and you really want to be extra careful dealing with them.