Just has you have said, because a token or coin is cheap doesn't guarantee profit from it. This is part of the reason why some people don't invest in BTC. They think of the high price forgotten they can buy as small as they can with whatever they have. BTC will always be the best coin to invest in. But if you which to go for altcoin, there are some altcoin as well that we hope to do well always in future. It's better you do your own research to pick some of them to fill your bag.
Agree and I think for now the most potential remains BTC and nothing else. And if those who want to use Altcoins must also identify these coins, we must have expertise, especially in technical analysis. one more thing If we want to be successful, we have to make some plans in the short, medium and long term. We must know what we will do in this period. So that when we are old we can enjoy we life.