Nothing is certain in crypto, even for a low market cap altcoins.
There's no certained but as long as you deal with your good research and you are fully aware with the team who created
the project having a good chance to earned value from each coins that
you'll going to pick for your investment.
To select promising aspects of it are even harder for low market cap since its main selling point is already that.
It's hard to determined which are the one that will really continue to developed and which is the one that will only
use as pumped and dumped mediums, you need to analyze and
make sure that you really done with your research work before
investing your hard earned money.