Why put yourself at risk?

$Alibaba(BABA.US)$ $Sea(SE.US)$
In mid-May, the two stock prices of BABA and SE met at 210+-. At the time, I was optimistic about e-commerce transactions and bought both companies at the same time. Good luck. After the purchase, the two groups went up together, then Baba dropped back from 227 to the cost price of 210+ - I thought, “You have news every day, are in the limelight, and have a lot of things; usually good companies make a lot of noise and wealth.” How many companies are there in the world, and why are you exposing yourself to risk? I resolutely sold Baba and kept SE.
Watching back today SE has given me +57% in return
There are so many good companies... why keep looking at high-risk stocks...