I get all the information about the crypto. If the coin has some promising feature that could lead to a technological development, I would hold on to that one. But if a coin has been brought just for the namesake with zero offerings, I would surely buy them cheap and dump them when they are hyped up.
Indeed, we can't rely just based on the hype or fomo of the coin we want to buy. The chance for getting profit is very low if we do that.
Not to mention that there are some people manipulating the coin price by buying or selling with huge amount, which can create hype for a coin and catch many buyers to buy that coin then dump it.