This isn't true for "all" altcoins, not all of them are like that, some of them are actually decent, like for example take the biggest one in example ETH, that is a big one right? So you do not get in and out quickly there and that is why I believe that we shouldn't really be focusing on anything like that, you could buy it and hold it for long term as well.
The method of getting and out quickly is for shitcoins and if you do that then you could probably make some profit with it and that could be the way to go and I agree that we could make money only with that method, but that is not something I would suggest to anyone. This is why the best way to move forward would be just getting greater return in the end for all of this, it couldn't be really that bad at all.
The quoted post and mine also are still saying the same thing as you have put out here, majority of Altcoins are simply pump and dump shitcoins and anyone investing in them must be ready to get in and take out their profits early. This isn’t saying that they aren’t Altcoins with utility and they won’t dump easily like the top 10 in market caps but the rest are simply in same category and that’s why you need to invest carefully.
If you even study this top Altcoins you have mentioned like ETH after they did a good pump in their early days which one actually has been making such move again? none, even bitcoin which is regarded to be low in volatility has a better return in percentage over the last two years than most of them with utility. And as the question is whether 5x is possible in this bull run do you think some of this utility Altcoins have the potential to do a 5x from their current position? I personally do not see some of them making that number now