Even if it promising and can potentially give you 1000% returns, don't buy when it is pumping.
No matter what, every coin follows supply and demand trends.
When something has pumped 5% or more, it will inevitably price check and drop.
The higher and faster the rise, the sharper the fall.
So in the case of cosmos, just wait a couple days to a week, guaranteed it will dip in price.
It is the law of market economics.
As you practice being patient you will find that you can look at coins and prices more objectively.
This will also help you out a lot in the long run.