The idea of investing in weak currencies just because they are cheap is a bad idea, most of them will never recover, investing in them is like you expect your luck.
I think you can see from the coins that you buy, when you buy coins that are already broken or can be called shitcoin then you will not get profit, but when you only trade on bitcoin and ethereum then you will get profit when you buy when there are the opportunity when the price of these two coins fell, a few days ago the price of many fell and now has begun to rise again.